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java.lang.VerifyError: Cannot inherit from final class with spring websocket

I'm new in websocket with Spring,I have an error with my unit test
[java.lang.VerifyError: Cannot inherit from final class]
in the line SockJsClient sockJsClient = new SockJsClient(transports);.
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import javax.annotation.Nullable;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.messaging.simp.stomp.StompFrameHandler;
import org.springframework.messaging.simp.stomp.StompHeaders;
import org.springframework.messaging.simp.stomp.StompSession;
import org.springframework.messaging.simp.stomp.StompSessionHandlerAdapter;
import org.springframework.web.socket.client.standard.StandardWebSocketClient;
import org.springframework.web.socket.messaging.WebSocketStompClient;
import org.springframework.web.socket.sockjs.client.SockJsClient;
import org.springframework.web.socket.sockjs.client.Transport;
import org.springframework.web.socket.sockjs.client.WebSocketTransport;
import org.springframework.web.socket.sockjs.frame.Jackson2SockJsMessageCodec;
import com.pharmagest.entite.websocket.ServerMessage;
import com.pharmagest.guiriden.offidose.websocket.DefEndPoint;
#SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.DEFINED_PORT)
public class ProductionWebSocketServiceTest2 {
/**
* WebSocket parameters
*/
private static final String PORT = "9181";
private static final String URL_WEB_SOCKET = "ws://localhost:" + PORT + "/offidose";
/**
* Timeout to receive a response on a broker
*/
private static final int TIMEOUT = 200;
/**
* WebSocket session & Queue to stock data
*/
private StompSession stompSession;
private BlockingQueue<ServerMessage> blockingQueue;
#Before
public void setup() {
try {
blockingQueue = new LinkedBlockingQueue<>();
Transport webSocketTransport = new WebSocketTransport(new StandardWebSocketClient());
List<Transport> transports = Collections.singletonList(webSocketTransport);
SockJsClient sockJsClient = new SockJsClient(transports);
sockJsClient.setMessageCodec(new Jackson2SockJsMessageCodec());
WebSocketStompClient stompClient = new WebSocketStompClient(sockJsClient);
stompSession = stompClient.connect(URL_WEB_SOCKET, new StompSessionHandlerAdapter() {
}).get(TIMEOUT, TimeUnit.MILLISECONDS);
} catch (InterruptedException | ExecutionException | TimeoutException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
stompSession.subscribe(DefEndPoint.SUBSCRIBE_EXPORT_PROD, new DefaultStompFrameHandler(ServerMessage.class));
}
#Test
public void testWebSocketEndPointExportProd()
throws InterruptedException {
stompSession.send(DefEndPoint.SUBSCRIBE_EXPORT_PROD, new ServerMessage());
ServerMessage sm = blockingQueue.poll(TIMEOUT, TimeUnit.MILLISECONDS);
Assert.assertEquals("Hello World From Server", sm.getMessage());
}
private class DefaultStompFrameHandler
implements StompFrameHandler {
private Class respClass;
DefaultStompFrameHandler(final Class respClass) {
this.respClass = respClass;
}
#Override
public Type getPayloadType(final StompHeaders stompHeaders) {
return respClass;
}
#Override
public void handleFrame(final StompHeaders stompHeaders, #Nullable final Object o) {
if (o != null && o instanceof ServerMessage) {
blockingQueue.offer((ServerMessage) o);
}
}
}
}
The error:
java.lang.VerifyError: Cannot inherit from final class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at com.fasterxml.jackson.datatype.jdk8.Jdk8Module.setupModule(Jdk8Module.java:30)
at com.fasterxml.jackson.databind.ObjectMapper.registerModule(ObjectMapper.java:524)
at org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.registerWellKnownModulesIfAvailable(Jackson2ObjectMapperBuilder.java:734)
at org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.configure(Jackson2ObjectMapperBuilder.java:624)
at org.springframework.http.converter.json.Jackson2ObjectMapperBuilder.build(Jackson2ObjectMapperBuilder.java:608)
at org.springframework.web.socket.sockjs.frame.Jackson2SockJsMessageCodec.<init>(Jackson2SockJsMessageCodec.java:51)
at org.springframework.web.socket.sockjs.client.SockJsClient.<init>(SockJsClient.java:107)
at com.pharmagest.services.websocket.production.ProductionWebSocketServiceTest2.setup(ProductionWebSocketServiceTest2.java:67)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

Issue while using Join class of Apache Beam

I was writing a code to do a LeftOuterJoin using Apache beam the Class provided by apache to do work easily apache Provide a join class org.apache.beam.sdk.extensions.joinlibrary.Join; While the whole code works properly when I use POJO class or String, Integer, Long in KV format but fails when I use TableRow in KV and Throws an Exception.
I have also Shared a Code Below the Exception for reference.
Apr 12, 2018 6:26:03 PM org.apache.beam.sdk.Pipeline validate
WARNING: The following transforms do not have stable unique names: ParDo(Anonymous), Create.Values
Exception in thread "main" java.lang.IllegalArgumentException: unable to serialize DoFnAndMainOutput{doFn=org.apache.beam.sdk.extensions.joinlibrary.Join$2#1817f1eb, mainOutputTag=Tag<output>}
at org.apache.beam.sdk.util.SerializableUtils.serializeToByteArray(SerializableUtils.java:57)
at org.apache.beam.runners.direct.repackaged.runners.core.construction.ParDoTranslation.translateDoFn(ParDoTranslation.java:440)
at org.apache.beam.runners.direct.repackaged.runners.core.construction.ParDoTranslation$1.translateDoFn(ParDoTranslation.java:148)
at org.apache.beam.runners.direct.repackaged.runners.core.construction.ParDoTranslation.payloadForParDoLike(ParDoTranslation.java:656)
at org.apache.beam.runners.direct.repackaged.runners.core.construction.ParDoTranslation.translateParDo(ParDoTranslation.java:144)
at org.apache.beam.runners.direct.repackaged.runners.core.construction.ParDoTranslation$ParDoPayloadTranslator.translate(ParDoTranslation.java:108)
at org.apache.beam.runners.direct.repackaged.runners.core.construction.PTransformTranslation.toProto(PTransformTranslation.java:193)
at org.apache.beam.runners.direct.repackaged.runners.core.construction.ParDoTranslation.getParDoPayload(ParDoTranslation.java:515)
at org.apache.beam.runners.direct.repackaged.runners.core.construction.ParDoTranslation.isSplittable(ParDoTranslation.java:525)
at org.apache.beam.runners.direct.repackaged.runners.core.construction.PTransformMatchers$4.matches(PTransformMatchers.java:194)
at org.apache.beam.sdk.Pipeline$2.visitPrimitiveTransform(Pipeline.java:278)
at org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:670)
at org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:662)
at org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:662)
at org.apache.beam.sdk.runners.TransformHierarchy$Node.access$600(TransformHierarchy.java:311)
at org.apache.beam.sdk.runners.TransformHierarchy.visit(TransformHierarchy.java:245)
at org.apache.beam.sdk.Pipeline.traverseTopologically(Pipeline.java:458)
at org.apache.beam.sdk.Pipeline.replace(Pipeline.java:256)
at org.apache.beam.sdk.Pipeline.replaceAll(Pipeline.java:209)
at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:173)
at org.apache.beam.runners.direct.DirectRunner.run(DirectRunner.java:62)
at org.apache.beam.sdk.Pipeline.run(Pipeline.java:311)
at org.apache.beam.sdk.Pipeline.run(Pipeline.java:297)
at com.bitwise.StarterPipeline.main(StarterPipeline.java:93)
Caused by: java.io.NotSerializableException: com.google.api.services.bigquery.model.TableRow
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at org.apache.beam.sdk.util.SerializableUtils.serializeToByteArray(SerializableUtils.java:53)
... 23 more
Code
import org.apache.beam.runners.dataflow.options.DataflowPipelineOptions;
import org.apache.beam.runners.direct.DirectRunner;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.extensions.joinlibrary.Join;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.sdk.transforms.Create;
import org.apache.beam.sdk.transforms.DoFn;
import org.apache.beam.sdk.transforms.ParDo;
import org.apache.beam.sdk.values.KV;
import org.apache.beam.sdk.values.PCollection;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.api.services.bigquery.model.TableRow;
public class StarterPipeline {
private static final Logger LOG = LoggerFactory.getLogger(StarterPipeline.class);
static transient TableRow t= new TableRow();
public static void main(String[] args) {
DataflowPipelineOptions options = PipelineOptionsFactory.as(DataflowPipelineOptions.class);
options.setRunner(DirectRunner.class);
options.setProject("Project Name");
options.setTempLocation("Location");
options.setStagingLocation("Location");
Pipeline p = Pipeline.create(options);
PCollection<KV<String, String>> leftPcollection = p.apply(Create.of("Kishan")).apply(ParDo.of(new DoFn<String,KV<String,String>>(){
#ProcessElement
public void processElement(ProcessContext c){
c.output(KV.of("Kishan", "Kumar"));
c.output(KV.of("Kishan1", "Test"));
}
}));
//
PCollection<KV<String, TableRow>> rightPcollection = p.apply(Create.of("Kishan")).apply(ParDo.of(new DoFn<String,KV<String,TableRow>>(){
#ProcessElement
public void processElement(ProcessContext c){
c.output(KV.of("Kishan",new TableRow().set("Key", "Value")));
}
}));
//
PCollection<TableRow> joinedPcollection =
Join.leftOuterJoin(leftPcollection, rightPcollection,t).apply("Tesdt",ParDo.of(new DoFn<KV<String, KV<String, TableRow>>,TableRow>(){
#ProcessElement
public void processElement(ProcessContext c){
//Processing
}
}));
p.run();
}
}

This is because your DoFn is serialized with Java serialization in order to distribute and run it, but TableRow cannot be serialized via Java serialization.
I don't see where in your code snippet there is an actual TableRow value in the closure of a DoFn but that is surely the cause.

Not able to access File with Singleton pattern

I wrote java class that simulate Hard disk using file .
The Hard disk calss is Singleton . I am now using Junit to test some other class in the project and need to use the Hard disk calss .
From some reason every time I use the method HardDisk.getInstance();
in the Junit I get the error IOException. if I delete the file the error changes to fileNotFound, so I know the class is kinda of working .
Class Junit
import com.hit.algorithm.IAlgoCache;
import com.hit.algorithm.LRUAlgoCacheImpl;
import com.hit.memoryunits.*;
import junit.framework.Assert;
import static org.junit.Assert.*;
import java.io.IOException;
import org.junit.Test;
public class MemoryManagementUnitTest {
#Test
public void testGetPages() throws IOException {
HardDisk.getInstance();
}
}
class Hard Disk
package com.hit.memoryunits;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.LinkedHashMap;
import java.util.Map.Entry;
public class HardDisk{
static final String DEFAULT_FILE_NAME="src\\main\\test\\hdPages.txt";
static final int _SIZE=1000;
//private static final HardDisk instance=new HardDisk();
private static HardDisk instance=new HardDisk();
LinkedHashMap<Long,Page<byte[]>> harDiskMap;
#SuppressWarnings({ "unchecked"})
private HardDisk(){
harDiskMap = new LinkedHashMap<>(_SIZE);
try{
FileInputStream fis = new FileInputStream(DEFAULT_FILE_NAME);
ObjectInputStream in = new ObjectInputStream(fis);
try{
while(true){
Page<byte[]> temp = (Page<byte[]>)in.readObject();
harDiskMap.put(temp.getPageId(), temp);
}
}
finally{
in.close();
}
}
catch (ClassNotFoundException e){
System.out.println("ClassNotFoundException");
}
catch (FileNotFoundException e1){
System.out.println("FileNotFoundException");
}
catch(IOException e2){
System.out.println("IOException");
}
}
public static HardDisk getInstance(){
return HardDisk.instance;
}
private void writeHd() throws FileNotFoundException, IOException{
ObjectOutputStream out= new ObjectOutputStream(new FileOutputStream(DEFAULT_FILE_NAME));
for(Entry<Long, Page<byte[]>> entry : harDiskMap.entrySet()) {
Long key = entry.getKey();
out.writeObject(harDiskMap.get(key));
}
out.close();
}
public Page<byte[]> pageFault(Long pageId)throws FileNotFoundException,IOException{
if(!this.harDiskMap.containsKey(pageId))
this.harDiskMap.put(pageId, new Page<byte[]>( new byte[]{}, pageId));
Page<byte[]> temp=this.harDiskMap.get(pageId);
return temp;
}
public Page<byte[]> pageReplacement(Page<byte[]> moveToHdPage,Long moveToRamId) throws java.io.FileNotFoundException,java.io.IOException{
harDiskMap.replace(moveToHdPage.getPageId(), moveToHdPage);
writeHd();
return pageFault(moveToRamId);
}
}
Hi this the output
java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.readShort(Unknown Source)
at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
at java.io.ObjectInputStream.<init>(Unknown Source)
at com.hit.memoryunits.HardDisk.<init>(HardDisk.java:26)
at com.hit.memoryunits.HardDisk.<clinit>(HardDisk.java:17)
at com.hit.memoryunits.MemoryManagementUnitTest.testGetPages(MemoryManagementUnitTest.java:33)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)

JUnit for RestController with parameter PersistentEntityResourceAssembler

could you please help me.
I try to implement an JUnit-Test for a Restcontroller with parameter PersistentEntityResourceAssembler.
Here is my RestController:
import java.util.Map;
import org.apache.camel.ProducerTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
#RestController
public class GreetingController2 {
#Autowired
ProducerTemplate pt;
#RequestMapping(value = "/greeting2", method = RequestMethod.POST)
public ResponseEntity<Greeting> updateGreeting( PersistentEntityResourceAssembler assembler,
#RequestHeader HttpHeaders header, #RequestBody Greeting greeting) {
Map<String, Object> headers = (Map) header.toSingleValueMap();
greeting=(Greeting) pt.requestBodyAndHeaders("direct:start", greeting, headers);
return new ResponseEntity<Greeting>(greeting, HttpStatus.OK);
}
}
And my JunitTest:
public class GreetingControllerMocksTest2 extends AbstractControllerTest2 {
#Mock
private ProducerTemplate producerTemplate;
#InjectMocks
private GreetingController2 greetingController2;
#Before
public void setUp() {
// Initialize Mockito annotated components
MockitoAnnotations.initMocks(this);
// Prepare the Spring MVC Mock components for standalone testing
setUp(greetingController2);
}
#Test
public void testRestEndpoint() throws Exception {
// Create some test data
Greeting entity = new Greeting(5,"Rudi");
// Stub the GreetingService.update method return value
when(producerTemplate.requestBodyAndHeaders(anyString(),anyObject(),
anyObject())).thenReturn(entity);
// Perform the behavior being tested
String uri = "/greeting2";
String inputJson = super.mapToJson(entity);
MvcResult result = mvc
.perform(MockMvcRequestBuilders.post(uri)
.contentType(MediaType.APPLICATION_JSON)
.accept(MediaType.APPLICATION_JSON).content(inputJson))
.andReturn();
// Extract the response status and body
String content = result.getResponse().getContentAsString();
int status = result.getResponse().getStatus();
// Verify the GreetingService.update method was invoked once
verify(producerTemplate,
times(1)).requestBodyAndHeaders(anyString(),anyObject(),anyObject());
// Perform standard JUnit assertions on the test results
Assert.assertEquals("failure - expected HTTP status 200", 200, status);
Assert.assertTrue(
"failure - expected HTTP response body to have a value",
content.trim().length() > 0);
Greeting updatedEntity = super.mapFromJson(content, Greeting.class);
Assert.assertNotNull("failure - expected entity not null",
updatedEntity);
}
}
When starting the junit-test i get the following Exception:
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler]: No default constructor found; nested exception is java.lang.NoSuchMethodException: org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler.<init>()
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:979)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:65)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:167)
at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:134)
at org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:155)
at org.example.ws.web.api.GreetingControllerMocksTest2.testRestEndpoint(GreetingControllerMocksTest2.java:83)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:254)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:89)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:193)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler]: No default constructor found; nested exception is java.lang.NoSuchMethodException: org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler.<init>()
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:107)
at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.createAttribute(ModelAttributeMethodProcessor.java:137)
at org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute(ServletModelAttributeMethodProcessor.java:80)
at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:106)
at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:99)
at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:161)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:128)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:832)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:743)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:961)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)
... 39 more
Caused by: java.lang.NoSuchMethodException: org.springframework.data.rest.webmvc.PersistentEntityResourceAssembler.<init>()
at java.lang.Class.getConstructor0(Unknown Source)
at java.lang.Class.getDeclaredConstructor(Unknown Source)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:104)
... 52 more
If i remove the paramter PersistentEntityResourceAssembler, then everthing works fine. But der RestController is generated by a tool, so it is not possible for me to remove this.

From your controller method I don't see if you are using PersistentEntityResourceAssembler. Please check your use case. To fix this, in your controller, you can use #RepositoryRestController instead of #RestController. Please check http://docs.spring.io/spring-data/rest/docs/current/reference/html/#customizing-sdr.overriding-sdr-response-handlers. I found the similar issue has been reported for some different use case. This issue is still in open state. https://jira.spring.io/browse/DATAREST-657

It seems that you have missed something.
I faced this error and fixed it, the problem was that I forgot to add an annotation #RequestBody to the parameter of the method.
Next code works fine:
//interface:
#ResponseStatus(value = HttpStatus.ACCEPTED)
#RequestMapping(method = RequestMethod.POST, produces = { MediaType.APPLICATION_JSON_VALUE }, consumes = { MediaType.APPLICATION_JSON_VALUE })
public Message greeting(#RequestBody GreetingRequestMessage requestMessage);
//implementation:
public Message greeting(#RequestBody GreetingRequestMessage requestMessage) {
}
//setup #Before:
mvc = MockMvcBuilders.standaloneSetup(testObj).build();
GreetingRequestMessage requestMessage = new GreetingRequestMessage();
payloadString = mapper.writeValueAsString(requestMessage);
//test:
payloadString = mapper.writeValueAsString(request);
mvc.perform(
MockMvcRequestBuilders.post("/greeting")
.content(payloadString)
.contentType(MediaType.APPLICATION_JSON).accept(MediaType.APPLICATION_JSON))
.andExpect(status().is(202));

JAXB Marshalling generic Tree

I have a generic Tree with a rather classical implementation:
package tree;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter;
import tree.persistence.EdgesAdapter;
import tree.persistence.NodesAdapter;
#XmlRootElement
#XmlAccessorType(XmlAccessType.FIELD)
public class Tree<N, E> {
#XmlElement
protected N root;
/**
* Map of nodes to adjacency outgoing of neighboring nodes to incident edges
*/
#XmlJavaTypeAdapter(NodesAdapter.class)
protected Map<N, Set<E>> nodes;
/**
* Map of edges to incident nodes pairs
*/
#XmlJavaTypeAdapter(EdgesAdapter.class)
protected Map<E, Pair<N>> edges;
#SuppressWarnings("unused")
private Tree() {
}
/**
*
*/
public Tree(N root) {
this.root = root;
nodes = new HashMap<N, Set<E>>();
edges = new HashMap<E, Pair<N>>();
nodes.put(root, new HashSet<E>());
}
public boolean addEdge(E edge, N parent, N child) {
//code to add edge and child node here...
}
}
and Pair class:
package tree;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
#XmlRootElement(name = "pair")
#XmlAccessorType(XmlAccessType.FIELD)
public class Pair<N> {
#XmlAttribute
private N first;
#XmlAttribute
private N second;
public Pair(N value1, N value2) {
if (value1 == null || value2 == null)
throw new IllegalArgumentException(
"Pair cannot contain null values");
first = value1;
second = value2;
}
#SuppressWarnings("unused")
private Pair() {
}
public N getFirst() {
return first;
}
public N getSecond() {
return second;
}
}
I have developped adapters so as to not have problems with structures like
Map<N, Set<E>>
and
Map<E, Pair<N>>.
But, when I try to Marshall a
Tree<String, Integer> tree
I have a null pointer exception:
#Test
public void testJAXBMarshaller() {
File file = new File("Tree.xml");
try {
JAXBContext jaxbContext = JAXBContext.newInstance(Tree.class,
Pair.class, String.class, Integer.class);
Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
jaxbMarshaller.setAdapter(new NodesAdapter());
jaxbMarshaller.marshal(tree, file);
jaxbMarshaller.marshal(tree, System.out);
} catch (JAXBException e) {
fail("testJAXBMarshaller " + e.getMessage());
}
}
Here is below the stack trace:
java.lang.NullPointerException
at com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor.get(TransducedAccessor.java:152)
at com.sun.xml.internal.bind.v2.runtime.property.AttributeProperty.<init>(AttributeProperty.java:76)
at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:93)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:166)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:496)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:515)
at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementProperty.<init>(ArrayElementProperty.java:97)
at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementNodeProperty.<init>(ArrayElementNodeProperty.java:47)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:113)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:166)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:496)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:515)
at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.<init>(SingleElementNodeProperty.java:90)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:113)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:166)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:496)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:313)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:124)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1143)
at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:147)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:247)
at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:234)
at javax.xml.bind.ContextFinder.find(ContextFinder.java:462)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:641)
at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:584)
at tree.TreeTest.testJAXBMarshaller(TreeTest.java:133)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
I just can't figure out where is my problem ?

The problem results from Pair.first and Pair.second being private fields.
a) You can make them public
b) Add public getters and use Accessor.PROPERTY.