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java.lang.NoClassDefFoundError when trying to load class from JAR

I am working on a project that is supposed to parse texts from PDF files.
Having multiple dependencies I have decided to build a combined JAR with all the dependencies and the classes.
However, when I build JAR including dependencies via Intellij IDEA even though the JAR file is added properly and I can import the class the program throws NoClassDefFoundError (Please refer to the screenshot).
Firstly, I thought the jar wasn't in the classpath. However, even if I add -cp TessaractPDF.jar through VM Options the class still get undetected.
I think it is worth to mention that, everything works smoothly if I build JAR without dependencies and add the dependencies manually.
What should I do?
Exception in thread "main" java.lang.NoClassDefFoundError: me/afifaniks/parsers/TessPDFParser
at Test.main(Test.java:20)
Caused by: java.lang.ClassNotFoundException: me.afifaniks.parsers.TessPDFParser
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
... 1 more
Code Snippet:
import me.afifaniks.parsers.TessPDFParser;
import java.io.IOException;
import java.util.HashMap;
public class Test {
public static void main(String[] args) throws IOException {
System.out.println(System.getProperty("java.classpath"));
HashMap<String, Object> arguments = new HashMap<>();
arguments.put("imageMode", "binary");
arguments.put("toFile", false);
arguments.put("tessDataPath", "/home/afif/Desktop/PDFParser/tessdata");
TessPDFParser pdfParser = new TessPDFParser("hiers15.pdf", arguments);
String text = (String) pdfParser.convert();
System.out.println(text);
}
}

NoClassDefFound of MasterNotRunning when using janusgraph backend HBase

I am using janusgraph, with storage backend HBase. Currently I am trying to add vertices to the database. The part of the code is
public class Graph {
private static JanusGraph graph = JanusGraphFactory.open("conf/jg.properties");
public static JanusGraph getGraph() {
return graph;
}
public static void addVertex() {
for (int i=0; i<5; i++) {
graph.addVertex("test", i);
}
graph.tx().commit();
}
}
with the main function calls
Graph.addVertex();
The error is
Exception in thread "main" java.lang.reflect.InvocationTargetException
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:498)
at org.eclipse.jdt.internal.jarinjarloader.JarRsrcLoader.main(JarRsrcLoader.java:58)
Caused by: java.lang.NoClassDefFoundError: org/apache/hadoop/hbase/MasterNotRunningException
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at org.janusgraph.util.system.ConfigurationUtil.instantiate(ConfigurationUtil.java:56)
at org.janusgraph.diskstorage.Backend.getImplementationClass(Backend.java:477)
at org.janusgraph.diskstorage.Backend.getStorageManager(Backend.java:409)
at org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration.<init>(GraphDatabaseConfiguration.java:1376)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:164)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:133)
at org.janusgraph.core.JanusGraphFactory.open(JanusGraphFactory.java:80)
... 5 more
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.hbase.MasterNotRunningException
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 16 more
I am using janusgraph 0.2.0, in maven 0.2.0
and hbase 1.2.0, java 1.8
I set storage-hostname=127.0.0.1 in jg.properties, so is it a dependency error? Where is exactly the MasterNotRunning?

I have found the solution, but still curious.
I search the class MasterNotRunning and found this is in package org.apache.hadoop.hbase and finally make a guess to add org.apache.hbase & hbase-client into dependency. And the error disappears.
However, I still could not find the reason of this error. If some code in dependency jar uses the class MasterNotRunning then it should import the hbase-client jar, then this should be already in the dependency. How can this code pass the compiling and finally throws an exception during the running time.
Just add, I uses export->runnable jar file to get my jar, so all the dependencies should be added into it.

How to do bytecode manipulation with Javassist for solving linkage errors?

I have posted several question related to javassit linkage error spring Exception when running application on WebSphere with java 8 . Now after some research work around this topics and error, i have got some useful information about bytecode manipulation with Javassist to solve linkage error .
For your reference ( Already posted this stack trace in another questions here )
[10/13/17 ] 00000089 webapp E com.ibm.ws.webcontainer.webapp.WebApp logServletError SRVE0293E: [Servlet Error]-[weblge]: java.lang.ExceptionInInitializerError
at java.lang.J9VMInternals.ensureError(J9VMInternals.java:134)
at java.lang.J9VMInternals.recordInitializationFailure(J9VMInternals.java:123)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:83)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:57)
at java.lang.reflect.Constructor.newInstance(Constructor.java:437)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:163)
at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:120)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:345)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:278)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103)
at com.ibm.ws.webcontainer.webapp.WebApp.notifyServletContextCreated(WebApp.java:1826)
at com.ibm.ws.webcontainer.webapp.WebAppImpl.initialize(WebAppImpl.java:442)
at com.ibm.ws.webcontainer.webapp.WebGroupImpl.addWebApplication(WebGroupImpl.java:88)
at com.ibm.ws.webcontainer.VirtualHostImpl.addWebApplication(VirtualHostImpl.java:171)
at com.ibm.ws.webcontainer.WSWebContainer.addWebApp(WSWebContainer.java:904)
at com.ibm.ws.webcontainer.WSWebContainer.addWebApplication(WSWebContainer.java:789)
at com.ibm.ws.webcontainer.component.WebContainerImpl.install(WebContainerImpl.java:427)
at com.ibm.ws.webcontainer.component.WebContainerImpl.start(WebContainerImpl.java:719)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:1247)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.fireDeployedObjectStart(DeployedApplicationImpl.java:1514)
at com.ibm.ws.runtime.component.DeployedModuleImpl.start(DeployedModuleImpl.java:704)
at com.ibm.ws.runtime.component.DeployedApplicationImpl.start(DeployedApplicationImpl.java:1096)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.startApplication(ApplicationMgrImpl.java:799)
at com.ibm.ws.runtime.component.ApplicationMgrImpl$5.run(ApplicationMgrImpl.java:2315)
at com.ibm.ws.security.auth.ContextManagerImpl.runAs(ContextManagerImpl.java:5488)
at com.ibm.ws.security.auth.ContextManagerImpl.runAsSystem(ContextManagerImpl.java:5614)
at com.ibm.ws.security.core.SecurityContext.runAsSystem(SecurityContext.java:255)
at com.ibm.ws.runtime.component.ApplicationMgrImpl.start(ApplicationMgrImpl.java:2320)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:436)
at com.ibm.ws.runtime.component.CompositionUnitImpl.start(CompositionUnitImpl.java:123)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.start(CompositionUnitMgrImpl.java:379)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl.access$500(CompositionUnitMgrImpl.java:127)
at com.ibm.ws.runtime.component.CompositionUnitMgrImpl$CUInitializer.run(CompositionUnitMgrImpl.java:985)
at com.ibm.wsspi.runtime.component.WsComponentImpl$_AsynchInitializer.run(WsComponentImpl.java:524)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1909)
Caused by: java.lang.IllegalStateException: javassist.CannotCompileException: by java.lang.LinkageError: org.springframework.aop.framework.ProxyCreatorSupport
at org.springframework.aop.framework.JavassistApplicationContext.<clinit>(JavassistApplicationContext.java:36)
... 34 more
Caused by: javassist.CannotCompileException: by java.lang.LinkageError: org.springframework.aop.framework.ProxyCreatorSupport
at javassist.ClassPool.toClass(ClassPool.java:1170)
at javassist.ClassPool.toClass(ClassPool.java:1113)
at javassist.ClassPool.toClass(ClassPool.java:1071)
at javassist.CtClass.toClass(CtClass.java:1275)
at org.springframework.aop.framework.JavassistApplicationContext.<clinit>(JavassistApplicationContext.java:34)
... 34 more
Caused by: java.lang.LinkageError: org.springframework.aop.framework.ProxyCreatorSupport
at java.lang.ClassLoader.defineClassImpl(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:357)
at java.lang.ClassLoader.defineClass(ClassLoader.java:293)
at sun.reflect.GeneratedMethodAccessor17.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:55)
at java.lang.reflect.Method.invoke(Method.java:508)
at javassist.ClassPool.toClass2(ClassPool.java:1183)
at javassist.ClassPool.toClass(ClassPool.java:1164)
... 38 more
and i am getting this error on this java file , when i am trying do operation on org.springframework.aop.framework.ProxyCreatorSupport
package org.spring.aop.framework;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.CtConstructor;
import javassist.LoaderClassPath;
import org.springframework.web.context.support.XmlWebApplicationContext;
public class JavassistApplicationContext extends XmlWebApplicationContext {
static {
ClassPool classPool = ClassPool.getDefault();
try {
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
classPool.appendClassPath(new LoaderClassPath(classLoader));
CtClass cc = classPool.get("org.spring.aop.framework.ProxyCreatorSupport");
CtConstructor c = cc.getConstructors()[0];
c.insertAfter("$0.aopProxyFactory = new org.spring.aop.framework.JavassistAopProxyFactory();");
cc.toClass();
} catch (Exception e) {
throw new IllegalStateException(e);
}
}
}
on the line cc.toClass(); , i am getting this exception . I have tried different class loader methods on WebSphere to solve this exception and getting same error .
Now i understood that linkage problem is occur when tries to modify the class already loaded by referenced classloader . being able to solve this error , i should unload the class first from the reference classloader and i think it's difficult .
So i think the only method to solve this with the implementation of bytecode manipulation before the class loader by any class loader . isn't?
How to change my existing code to bytecode manipulation with java agent ? Any idea and suggestion ? please don't put as a duplicate question . This is only the reference work of the previous question .

You need to write a Java agent and attach it dynamically to transform a class at load time. You can find a cool tutorial here that explains how to do it.
Note that this method allows you to intercept the class while it's loaded by the JVM and modify it after this loading is actually done.

ERROR Code=-4220 and SQLSTATE= null

I am using db2 version 10.5 and inserting the values into the DB2JSON, created a simple standalone java program to retrieve all the values from the table(Collection) when I run the query I am getting the following error
Exception in thread "main" java.lang.RuntimeException: com.ibm.db2.jcc.am.SqlException: [jcc][t4][1065][12306][3.69.66] Caught java.io.CharConversionException. See attached Throwable for details. ERRORCODE=-4220, SQLSTATE=null
at com.ibm.nosql.json.api.DBObjectRowHandler.handle(DBObjectRowHandler.java:38)
at com.ibm.nosql.json.api.DBObjectRowHandler.handle(DBObjectRowHandler.java:14)
at com.ibm.nosql.json.api.BaseResultIterator.next(BaseResultIterator.java:119)
at com.ibm.nosql.json.api.DBCursor.fetchResultsEagerly(DBCursor.java:801)
at com.ibm.nosql.json.api.DBCursor.find(DBCursor.java:895)
at com.ibm.nosql.json.api.DBCursor.hasNext(DBCursor.java:278)
at com.ws.Demo.TestingDemo.main(TestingDemo.java:47)
Caused by: com.ibm.db2.jcc.am.SqlException: [jcc][t4][1065][12306][3.69.66] Caught java.io.CharConversionException. See attached Throwable for details. ERRORCODE=-4220, SQLSTATE=null
at com.ibm.db2.jcc.am.gd.a(gd.java:733)
at com.ibm.db2.jcc.am.gd.a(gd.java:66)
at com.ibm.db2.jcc.am.gd.a(gd.java:120)
at com.ibm.db2.jcc.am.kc.a(kc.java:2868)
at com.ibm.db2.jcc.am.kc.p(kc.java:525)
at com.ibm.db2.jcc.am.kc.Z(kc.java:2747)
at com.ibm.db2.jcc.am.ResultSet.getObjectX(ResultSet.java:1438)
at com.ibm.db2.jcc.am.ResultSet.getObject(ResultSet.java:1413)
at com.ibm.nosql.json.api.DBResultSet.getObject(DBResultSet.java:255)
at com.ibm.nosql.json.api.DBData.getObjectX(DBData.java:66)
at com.ibm.nosql.json.api.DBObjectRowHandler.getObjectID(DBObjectRowHandler.java:58)
at com.ibm.nosql.json.api.DBObjectRowHandler.handle(DBObjectRowHandler.java:28)
... 6 more
Caused by: java.nio.charset.MalformedInputException: Input length = 290
at com.ibm.db2.jcc.am.r.a(r.java:19)
at com.ibm.db2.jcc.am.kc.a(kc.java:2864)
... 14 more
Caused by: sun.io.MalformedInputException
at sun.io.ByteToCharUTF8.convert(ByteToCharUTF8.java:292)
at com.ibm.db2.jcc.am.r.a(r.java:16)
... 15 more
I also went throught few posts where it suggest to use db2.jcc.charsetDecoderEncoder=3 but I have no idea where to use it, and also I few other posts it is suggested touse the lastest version db2jcc.jar, I am using the jars that is present inside the db2 10.5 under sqllib folder. Anyone let me know how to fix this

Add the following environment variable(Java VM arguments) in your tomcat settings
-Ddb2.jcc.charsetDecoderEncoder=3
This worked.

You can set the charset decoder encoder using system property inside your Java code.
For example:
System.setProperty("db2.jcc.charsetDecoderEncoder", "3");

Official supercsv dozer example does not work with Play — Play 2.1.1, Java

Update:
Now I found out something very strange, it works when i put the compiled test classes directly
into the "super-csv-dozer-2.1.0.jar" with the same structure as in the svn repo.
But as soon as i use my own package it wont work. I always used the entire path
like this: myPackage.csv.SurveyResponse.class
What am i missing? and why does it work in a normal Java Project but not in a Play Project?
I also tried it outside of eclipse in a different directory and dont have any checkouts from
the svn repo that could confuse the paths. Another thing i tried is to put the Writing.class into adifferent package but didnt help.
Original qustion:
Im trying to use SuperCSV with Dozer in a Play Project.
The official supercsv sample works fine in a separate Java Project.
But when I put the code and the needed SuperCSV Jars in a freshly created Play project I always
get a ClassNotfoundException for SurveyResponse.class in this line of code:
beanWriter.configureBeanMapping(myPackage.csv.SurveyResponse.class, FIELD_MAPPING);
Here a screenshot of my project structure:
http://oi44.tinypic.com/mrqp7s.jpg
I made sure that all the JARS are available, I put them unmanaged into the /lib folder,
they are available in eclipse and no errors appear during compilation.
I debugged the code and the SurveyResponse.class is found and the beanWriter is initialized.
So somehow Play must do some magic in the background to trigger this bug.
What could play be doing in the background to possibly trigger such odd behavior?
What could I try to do to fix this?
Changes I made to the sample so it works with Play:
I used exactly the same code as the offical supercsv example.
The only change i did is remove the Writing.main(..) method and set the methods Writing.writeWithDozerCsvBeanWriter()
and Writing.partialWriteWithCsvDozerBeanWriter() to public,so it can be accessed from the Application controller.
And of course I changed the package name in all classes to package myPackage.test;
Links to sample:
See in the comment, i cant add more than 2 links because of low reputation.
Controller:
public class Application extends Controller {
public static Result index() throws Exception {
Writing.writeWithDozerCsvBeanWriter();
Writing.partialWriteWithCsvDozerBeanWriter();
return ok(index.render("Your new application is ready."));
}
}
Code that triggers error in Writing class:
ICsvDozerBeanWriter beanWriter = null;
try {
beanWriter = new CsvDozerBeanWriter(new FileWriter("target/writeWithCsvDozerBeanWriter.csv"),
CsvPreference.STANDARD_PREFERENCE);
// configure the mapping from the fields to the CSV columns
//Here the exception occures:
beanWriter.configureBeanMapping(myPackage.csv.SurveyResponse.class, FIELD_MAPPING);
Stack trace:
play.api.Application$$anon$1: Execution exception[[MappingException: java.lang.ClassNotFoundException: myPackage.test.SurveyResponse]]
at play.api.Application$class.handleError(Application.scala:289) ~[play_2.10.jar:2.1.1]
at play.api.DefaultApplication.handleError(Application.scala:383) [play_2.10.jar:2.1.1]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anon$2$$anonfun$handle$1.apply(PlayDefaultUpstreamHandler.scala:144) [play_2.10.jar:2.1.1]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anon$2$$anonfun$handle$1.apply(PlayDefaultUpstreamHandler.scala:140) [play_2.10.jar:2.1.1]
at play.api.libs.concurrent.PlayPromise$$anonfun$extend1$1.apply(Promise.scala:113) [play_2.10.jar:2.1.1]
at play.api.libs.concurrent.PlayPromise$$anonfun$extend1$1.apply(Promise.scala:113) [play_2.10.jar:2.1.1]
at play.api.libs.concurrent.PlayPromise$$anonfun$extend$1$$anonfun$apply$1.apply(Promise.scala:104) [play_2.10.jar:2.1.1]
at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24) [scala-library.jar:na]
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24) [scala-library.jar:na]
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) [na:1.6.0_37]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.6.0_37]
at java.lang.Thread.run(Unknown Source) [na:1.6.0_37]
org.dozer.MappingException: java.lang.ClassNotFoundException: myPackage.test.SurveyResponse
at org.dozer.util.MappingUtils.throwMappingException(MappingUtils.java:82) ~[dozer-5.4.0.jar:na]
at org.dozer.util.DefaultClassLoader.loadClass(DefaultClassLoader.java:38) ~[dozer-5.4.0.jar:na]
at org.dozer.util.MappingUtils.loadClass(MappingUtils.java:224) ~[dozer-5.4.0.jar:na]
at org.dozer.loader.DozerBuilder$MappingBuilder.classA(DozerBuilder.java:129) ~[dozer-5.4.0.jar:na]
at org.dozer.loader.api.BeanMappingBuilder.mapping(BeanMappingBuilder.java:72) ~[dozer-5.4.0.jar:na]
at org.dozer.loader.api.BeanMappingBuilder.mapping(BeanMappingBuilder.java:67) ~[dozer-5.4.0.jar:na]
at org.supercsv.io.dozer.CsvDozerBeanWriter$MappingBuilder.configure(CsvDozerBeanWriter.java:178) ~[super-csv-dozer-2.1.0.jar:na]
at org.dozer.loader.api.BeanMappingBuilder.build(BeanMappingBuilder.java:42) ~[dozer-5.4.0.jar:na]
at org.dozer.DozerBeanMapper.addMapping(DozerBeanMapper.java:258) ~[dozer-5.4.0.jar:na]
at org.supercsv.io.dozer.CsvDozerBeanWriter.configureBeanMapping(CsvDozerBeanWriter.java:91) ~[super-csv-dozer-2.1.0.jar:na]
at myPackage.test.Writing.writeWithDozerCsvBeanWriter(Writing.java:88) ~[na:na]
at controllers.Application.index(Application.java:12) ~[na:na]
at Routes$$anonfun$routes$1$$anonfun$applyOrElse$1$$anonfun$apply$1.apply(routes_routing.scala:49) ~[na:na]
at Routes$$anonfun$routes$1$$anonfun$applyOrElse$1$$anonfun$apply$1.apply(routes_routing.scala:49) ~[na:na]
at play.core.Router$HandlerInvoker$$anon$6$$anon$2.invocation(Router.scala:164) ~[play_2.10.jar:2.1.1]
at play.core.Router$Routes$$anon$1.invocation(Router.scala:345) ~[play_2.10.jar:2.1.1]
at play.core.j.JavaAction$$anon$1.call(JavaAction.scala:31) ~[play_2.10.jar:2.1.1]
at play.core.j.JavaAction$$anon$2.apply(JavaAction.scala:74) ~[play_2.10.jar:2.1.1]
at play.core.j.JavaAction$$anon$2.apply(JavaAction.scala:73) ~[play_2.10.jar:2.1.1]
at play.libs.F$Promise$PromiseActor.onReceive(F.java:420) ~[play_2.10.jar:2.1.1]
at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:159) ~[akka-actor_2.10.jar:na]
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:425) ~[akka-actor_2.10.jar:na]
at akka.actor.ActorCell.invoke(ActorCell.scala:386) ~[akka-actor_2.10.jar:na]
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:230) ~[akka-actor_2.10.jar:na]
at akka.dispatch.Mailbox.run(Mailbox.scala:212) ~[akka-actor_2.10.jar:na]
at akka.dispatch.ForkJoinExecutorConfigurator$MailboxExecutionTask.exec(AbstractDispatcher.scala:502) ~[akka-actor_2.10.jar:na]
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:262) ~[scala-library.jar:na]
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:975) ~[scala-library.jar:na]
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1478) ~[scala-library.jar:na]
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104) ~[scala-library.jar:na]
Caused by: java.lang.ClassNotFoundException: myPackage.test.SurveyResponse
at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.6.0_37]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.6.0_37]
at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.6.0_37]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.6.0_37]
at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.6.0_37]
at sbt.PlayCommands$$anonfun$53$$anonfun$55$$anon$2.loadClass(PlayCommands.scala:535) ~[na:na]
at java.lang.Class.forName0(Native Method) ~[na:1.6.0_37]
at java.lang.Class.forName(Unknown Source) ~[na:1.6.0_37]
at org.apache.commons.lang3.ClassUtils.getClass(ClassUtils.java:823) ~[commons-lang3.jar:3.1]
at org.apache.commons.lang3.ClassUtils.getClass(ClassUtils.java:889) ~[commons-lang3.jar:3.1]
at org.apache.commons.lang3.ClassUtils.getClass(ClassUtils.java:872) ~[commons-lang3.jar:3.1]
at org.dozer.util.DefaultClassLoader.loadClass(DefaultClassLoader.java:36) ~[dozer-5.4.0.jar:na]
... 28 common frames omitted
Extra information:
I still couldnt solve the problem, but here some extra infomation to narrow down the problem:
The csv header is successfully written to the file when i remove the configureBeanMapping Method call (see code below).
The SurveyResponse class is working too when i do a System.out.println() on a filled SurveyResponse object (see code below).
So its not a problem with the package or class name.
The modiefied Code that writes only the header:
//...more code
myPackage.csv.SurveyResponse response3 = new myPackage.csv.SurveyResponse(42, false, Arrays.asList(new Answer(1, null), new Answer(2,
"Carl Sagan"), new Answer(3, "Star Wars")));
final List<myPackage.csv.SurveyResponse> surveyResponses = Arrays.asList(response1, response2, response3);
ICsvDozerBeanWriter beanWriter = null;
try {
beanWriter = new CsvDozerBeanWriter(new FileWriter("target/writeWithCsvDozerBeanWriter.csv"),
CsvPreference.STANDARD_PREFERENCE);
// configure the mapping from the fields to the CSV columns
//beanWriter.configureBeanMapping(myPackage.csv.SurveyResponse.class, FIELD_MAPPING);
//Prints the value 42 successfully
System.out.println(response3.getAge());
// write the header
beanWriter.writeHeader("age", "consentGiven", "questionNo1", "answer1", "questionNo2", "answer2","questionNo3", "answer3");
//...more code

From what I understand from the error, Play is trying to load the wrong class. Look at this line :
java.lang.ClassNotFoundException: org.supercsv.mock.dozer.SurveyResponse
I think that SurverResponse is one of your own project classes and not part of SuperCSV. Try to prefix it with the full path such as :
beanWriter.configureBeanMapping(whateverpackage.models.SurveyResponse.class, FIELD_MAPPING);

SurveyResponse and Answer are test classes of the super-csv-dozer artifact - so they aren't packaged in the distribution (i.e they're not in Maven or in the zip file on SourceForge).
You can view the test source online or checkout the SVN repo (which it sounds like you've already done) and just copy them into your Play project.
Both files are in the following directory:
supercsv/super-csv-dozer/src/test/java/org/supercsv/mock/dozer/
I'm a little curious why you're not getting a compilation error when trying to use SurveyResponse in your code. My guess is that you have the super-csv-dozer project checked out and open in your IDE and your project is finding it.