I'm new to ignite and trying to run my simple multi-node computation example. I wrote the following simple application:
try(Ignite ignite = Ignition.start("example-cache.xml")){
IgniteCompute asyncCompute = ignite.compute().withAsync();
for(int i = 0; i < 100; i++) {
int[] a = new int[1];
a[0] = i;
asyncCompute.call(() -> {
out.println(a[0]);
return a[0];
});
}
}
First I ran 3 server nodes with ignite.sh that is supplied with the binary ignite distribution. Each in a different JVM instance.
Then I build this application and run it with the same xml-spring config as the 3 server nodes before.
But actually I got the following exception:
class org.apache.ignite.IgniteCheckedException: com.test.App
at org.apache.ignite.internal.util.IgniteUtils.unmarshal(IgniteUtils.java:9826)
at org.apache.ignite.internal.processors.job.GridJobWorker.initialize(GridJobWorker.java:432)
at org.apache.ignite.internal.processors.job.GridJobProcessor.processJobExecuteRequest(GridJobProcessor.java:1108)
at org.apache.ignite.internal.processors.job.GridJobProcessor$JobExecutionListener.onMessage(GridJobProcessor.java:1894)
at org.apache.ignite.internal.managers.communication.GridIoManager.invokeListener(GridIoManager.java:1222)
at org.apache.ignite.internal.managers.communication.GridIoManager.processRegularMessage0(GridIoManager.java:850)
at org.apache.ignite.internal.managers.communication.GridIoManager.access$2100(GridIoManager.java:108)
at org.apache.ignite.internal.managers.communication.GridIoManager$7.run(GridIoManager.java:790)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: class org.apache.ignite.binary.BinaryInvalidTypeException: com.test.App
at org.apache.ignite.internal.binary.BinaryContext.descriptorForTypeId(BinaryContext.java:692)
at org.apache.ignite.internal.binary.BinaryUtils.doReadClass(BinaryUtils.java:1486)
at org.apache.ignite.internal.binary.BinaryUtils.doReadClass(BinaryUtils.java:1424)
at org.apache.ignite.internal.binary.BinaryReaderExImpl.readClass(BinaryReaderExImpl.java:370)
at org.apache.ignite.internal.binary.BinaryFieldAccessor$DefaultFinalClassAccessor.readFixedType(BinaryFieldAccessor.java:828)
at org.apache.ignite.internal.binary.BinaryFieldAccessor$DefaultFinalClassAccessor.read(BinaryFieldAccessor.java:639)
at org.apache.ignite.internal.binary.BinaryClassDescriptor.read(BinaryClassDescriptor.java:833)
at org.apache.ignite.internal.binary.BinaryReaderExImpl.deserialize0(BinaryReaderExImpl.java:1498)
at org.apache.ignite.internal.binary.BinaryReaderExImpl.deserialize(BinaryReaderExImpl.java:1450)
at org.apache.ignite.internal.binary.BinaryUtils.doReadObject(BinaryUtils.java:1640)
at org.apache.ignite.internal.binary.BinaryReaderExImpl.readObject(BinaryReaderExImpl.java:1124)
at org.apache.ignite.internal.processors.closure.GridClosureProcessor$C2V2.readBinary(GridClosureProcessor.java:2073)
at org.apache.ignite.internal.binary.BinaryClassDescriptor.read(BinaryClassDescriptor.java:823)
at org.apache.ignite.internal.binary.BinaryReaderExImpl.deserialize0(BinaryReaderExImpl.java:1498)
at org.apache.ignite.internal.binary.BinaryReaderExImpl.deserialize(BinaryReaderExImpl.java:1450)
at org.apache.ignite.internal.binary.GridBinaryMarshaller.deserialize(GridBinaryMarshaller.java:298)
at org.apache.ignite.internal.binary.BinaryMarshaller.unmarshal0(BinaryMarshaller.java:99)
at org.apache.ignite.marshaller.AbstractNodeNameAwareMarshaller.unmarshal(AbstractNodeNameAwareMarshaller.java:82)
at org.apache.ignite.internal.util.IgniteUtils.unmarshal(IgniteUtils.java:9820)
... 10 more
Caused by: java.lang.ClassNotFoundException: com.test.App
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.apache.ignite.internal.util.IgniteUtils.forName(IgniteUtils.java:8459)
at org.apache.ignite.internal.MarshallerContextAdapter.getClass(MarshallerContextAdapter.java:185)
at org.apache.ignite.internal.binary.BinaryContext.descriptorForTypeId(BinaryContext.java:683)
This exception is perfectly clear. But what do we need the ignite.sh script for?
You should either add you App class in classpath for all ignite nodes or
turn on peer-class-loading[1].
[1] https://apacheignite.readme.io/v1.9/docs/zero-deployment#peer-class-loading
You should add your JAR file to the lib/ folder under the Apache Ignite installation folder. Then you can start ignite.sh and all your classes will be automatically loaded.
Alternatively, you can try enabling peer-class-loading as suggested above, and Ignite will load the classes automatically.
Related
I am trying to use ARIMA object (Scala), which is imported from a package, in my Java program. Although the compilation succeeds, meaning that ARIMA class is recognized during compilation, there is NoClassDefFoundError for the ARIMA object in runtime. ARIMAModel class has no problem with importing since it is a class.
Is there any way to use the Scala object from my Java program?
Here is the source code for the object in Scala package.
File: .../com/cloudera/sparkts/models/ARIMA.scala
package com.cloudera.sparkts.models
object ARIMA {
def autoFit(ts: Vector, maxP: Int = 5, maxD: Int = 2, maxQ: Int = 5): ARIMAModel = {
...
}
}
class ARIMAModel(...) {
...
}
Here is my Java code.
File: src/main/java/SingleSeriesARIMA.java
import com.cloudera.sparkts.models.ARIMA;
import com.cloudera.sparkts.models.ARIMAModel;
public class SingleSeriesARIMA {
public static void main(String[] args) {
...
ARIMAModel arimaModel = ARIMA.autoFit(tsVector, 1, 0, 1);
...
}
}
Here is the error.
Exception in thread "main" java.lang.NoClassDefFoundError: com/cloudera/sparkts/models/ARIMA
at SingleSeriesARIMA.main(SingleSeriesARIMA.java:43)
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.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:729)
at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:185)
at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:210)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:124)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.ClassNotFoundException: com.cloudera.sparkts.models.ARIMA
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 10 more
I am using Scala version 2.11.8 and Java 1.8
You need to supply the dependency having Arima object present to the spark cluster using --jars option as below-
spark-submit --jars <path>/<to>/sparkts-0.4.1.jar --class SingleSeriesARIMA target/simple-project-1.0.jar
This will pass the other dependency along with the application jar to be available at spark-runtime.
TO call ARIMA object from java use-
ARIMA$.MODULE$.autoFit(tsVector, 1, 0, 1);
i have a problem in flink. my real-time compute engine use groovy script to expend compute type(like:sum、average、count adn so on). we define a standard compute interface(AbstractCompute),and if i want expand a compute type in this framework i just need impl AbstractCompute.and then store groovy script in the db. then application can read script by task and load into jvm by GroovyClassLoader.
This process does not use Flink again, depending on the work is very good。The reason is that Flink uses another ClassLoader (FlinkUserCodeClassLoaders$ChildFirstClassLoader) to load the object instantiated by the groovy script at checkpoint instead of using GroovyClassLoader.
Code
// Init Groovy ClassLoader
CompilerConfiguration classLoaderConfig = new CompilerConfiguration();
classLoaderConfig.setSourceEncoding("UTF-8");
CLASS_LOADER = new GroovyClassLoader(Thread.currentThread().getContextClassLoader(), classLoaderConfig);
......
......
// parse script and new instance and put into cache
Class clazz = CLASS_LOADER.parseClass(computeType.getScript());
AbstractComputable computableObject = (AbstractComputable) clazz.newInstance();
removeComputeType(computeType);
// 自定义计算方式对象存入缓存
IndicatorCache.COMPUTABLE_OBJECT_CACHE.put(computeType.getId().intValue(), computableObject);
......
......
AbstractComputable computable = IndicatorCache.COMPUTABLE_OBJECT_CACHE.get(indicator.getComputeType());
if (computable == null) {
if (log.isDebugEnabled()) {
log.debug("without computeType:{} in cache", indicator.getComputeType());
}
return false;
}
indicator.setComputableObject(computable);
Exception stack:
com.esotericsoftware.kryo.KryoException: Unable to find class: com.xxx.xxx.common.computable.CurValueCompute
Serialization trace:
computableObject (com.xxx.xxx.common.pojo.property.IndicatorProperty)
normalIndicatorList (com.xxx.xxx.common.pojo.property.ComputeTuple)
at com.esotericsoftware.kryo.util.DefaultClassResolver.readName(DefaultClassResolver.java:138)
at com.esotericsoftware.kryo.util.DefaultClassResolver.readClass(DefaultClassResolver.java:115)
at com.esotericsoftware.kryo.Kryo.readClass(Kryo.java:641)
at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:99)
at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528)
at com.esotericsoftware.kryo.Kryo.readClassAndObject(Kryo.java:761)
at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:116)
at com.esotericsoftware.kryo.serializers.CollectionSerializer.read(CollectionSerializer.java:22)
at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:679)
at com.esotericsoftware.kryo.serializers.ObjectField.read(ObjectField.java:106)
at com.esotericsoftware.kryo.serializers.FieldSerializer.read(FieldSerializer.java:528)
at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:657)
at org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.copy(KryoSerializer.java:231)
at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:577)
at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:554)
at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:534)
at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:718)
at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:696)
at org.apache.flink.streaming.api.operators.StreamMap.processElement(StreamMap.java:41)
at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:579)
at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:554)
at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:534)
at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:718)
at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:696)
at org.apache.flink.streaming.api.operators.StreamFilter.processElement(StreamFilter.java:40)
at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:579)
at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:554)
at org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:534)
at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:718)
at org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:696)
at org.apache.flink.streaming.api.operators.StreamSourceContexts$ManualWatermarkContext.processAndCollectWithTimestamp(StreamSourceContexts.java:310)
at org.apache.flink.streaming.api.operators.StreamSourceContexts$WatermarkContext.collectWithTimestamp(StreamSourceContexts.java:409)
at org.apache.flink.streaming.connectors.kafka.internals.AbstractFetcher.emitRecordWithTimestamp(AbstractFetcher.java:398)
at org.apache.flink.streaming.connectors.kafka.internal.Kafka010Fetcher.emitRecord(Kafka010Fetcher.java:89)
at org.apache.flink.streaming.connectors.kafka.internal.Kafka09Fetcher.runFetchLoop(Kafka09Fetcher.java:154)
at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.run(FlinkKafkaConsumerBase.java:738)
at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:94)
at org.apache.flink.streaming.api.operators.StreamSource.run(StreamSource.java:58)
at org.apache.flink.streaming.runtime.tasks.SourceStreamTask.run(SourceStreamTask.java:99)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:704)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: com.xxx.xxx.common.computable.CurValueCompute
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at org.apache.flink.runtime.execution.librarycache.FlinkUserCodeClassLoaders$ChildFirstClassLoader.loadClass(FlinkUserCodeClassLoaders.java:129)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at com.esotericsoftware.kryo.util.DefaultClassResolver.readName(DefaultClassResolver.java:136)
... 41 common frames omitted
How to use Groovy dynamic language correctly in Flink？
Flink needs to know the types it is processing. Otherwise it is not possible to serialize and deserialize the instances. Therefore, the class definitions need to be contained in the user code jar which you submit to the Flink cluster.
If you want to support dynamically loaded classes, then you should serialize these instances into a generic format (e.g. AbstractComputeContainer) which you completely resolve in the user code function where you have the GroovyClassLoader.
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.
I already have a C++ server containing a service that inserts an user to the DB, the service work's great when I test it on console.
But the fact is that I'm developing a Java client application that consumes the service with Apache Axis, unfortunately it doesn't works. I have been searching for information that could help me with this trouble but I don't see any similar implementation.
My Apache Axis files are in /usr/share/java, which is the value of my AXIS2_HOME variable, this, in order to execute:
java -cp $AXIS2_HOME org.apache.axis.wsdl.WSDL2Java -p CrearAlumno http://localhost/CrearAlumno.wsdl
to generate the files, later I execute:
javac -cp $AXIS2_HOME *.java
to compile my files Including the Client Class
//CrearAlumnoClient.java
package CrearAlumno;
import java.rmi.RemoteException;
import javax.xml.rpc.ServiceException;
public class CrearAlumnoClient{
public static void main(String[] args)
{
Input in = new Input("asdf", "adgfsdf", "asdg", 453, "asdf", "asdfasdf", "pasdfsd", "asdfsd");
try{
CrearAlumno_Service service = new CrearAlumno_ServiceLocator();
CrearAlumnoPortType port = service.getCrearAlumno();
String response = port.getInfo(in);
}catch(RemoteException e){
e.printStackTrace();
}catch(ServiceException e){
e.printStackTrace();
}
}
}
but when I excecute:
java CrearAlumno.CrearAlumnoClient
My application throws this errors:
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/rpc/ServiceException
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)
at java.lang.Class.privateGetMethodRecursive(Class.java:3048)
at java.lang.Class.getMethod0(Class.java:3018)
at java.lang.Class.getMethod(Class.java:1784)
at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)
Caused by: java.lang.ClassNotFoundException: javax.xml.rpc.ServiceException
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 7 more
I have no idea how to solve this errors, I have been searching for an implementation but at this moment, I dont have it.
I will also be pleased if anyone can show me a simply implementation of Axis and gsoap.
Thank you for your attention :).
This looks like a simple case of your classpath not being set up correctly.
There's information on that specific topic here: http://axis.apache.org/axis/java/install.html#Classpath_setup
You need to ensure that the jar file containing javax.xml.rpc.ServiceException is present.
I see you are setting up your classpath using -cp $AXIS2_HOME which won't work. At best if your jars are in $AXIS2_HOME then you will need to do $AXIS2_HOME/*.jar but it all liklihood you'll need to have something more like:
set AXIS_HOME=/usr/axis
set AXIS_LIB=$AXIS_HOME/lib
set AXISCLASSPATH=$AXIS_LIB/axis.jar:$AXIS_LIB/commons-discovery.jar:
$AXIS_LIB/commons-logging.jar:$AXIS_LIB/jaxrpc.jar:$AXIS_LIB/saaj.jar:
$AXIS_LIB/log4j-1.2.8.jar:$AXIS_LIB/xml-apis.jar:$AXIS_LIB/xercesImpl.jar:
$AXIS_LIB/wsdl4j.jar
export AXIS_HOME; export AXIS_LIB; export AXISCLASSPATH
Then invoke your application with:
java -cp $AXISCLASSPATH
With regards to integration between Axis and Gsoap it really should be quite straightforward. There shouldn't really be any special interventions required because you're crossing between java and c world - at least for simple use-cases.
I have a java project (Netbeans platforms and hibernate for ORM).i use hibernate build entities and add this jar file to my project and it work fine, When I add new table to Database and rebuild entities, it has error. the new entities class is not found though I have checked my code, but I don't find any solutions. Please help me(my table name is menu)
this i my code
for (int i = 0; i < table_row; i++) {
Menu menus = (Menu) items.get(i);
objectData[i][0] = menus.getId();
objectData[i][1] = menus.getTitle();
objectData[i][2] = menus.getLevel();
objectData[i][3] = menus.getParentId();
objectData[i][4] = menus.getClassname();
objectData[i][5] = menus.getCategoryId();
objectData[i][6] = menus.getIcon();
objectData[i][7] = menus.getOrder();
objectData[i][8] = menus.getCreated();
objectData[i][9] = menus.getModified();
}
and this is exception
Classes: loaded=3871 total loaded=3871 unloaded 0
INFO [org.netbeans.core.ui.warmup.DiagnosticTask]: Total memory 4,074,373,120
INFO [null]: Total physical memory 4,074,373,120
SEVERE [global]
java.lang.ClassNotFoundException: com.osstech.dbentities.Menu
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:222)
Caused: java.lang.ClassNotFoundException: com.osstech.dbentities.Menu starting from ModuleCL#302d6b3[com.osstech.Systems] with possible defining loaders [ModuleCL#759d36f1[com.osstech.dbentities]] and declared parents [ModuleCL#7f28abd9[org.netbeans.modules.settings], ModuleCL#fcd0400[org.openide.windows], org.netbeans.MainImpl$BootClassLoader#6db17b38, ModuleCL#561ac555[org.netbeans.api.progress], ModuleCL#52b4e7ec[com.osstech.DataAccess], ModuleCL#759d36f1[com.osstech.dbentities], ModuleCL#2716630b[com.osstech.wraplibrary], ModuleCL#6461d2bf[com.osstech.Utilities], ModuleCL#f27bf78[org.openide.awt]]
at org.netbeans.ProxyClassLoader.loadClass(ProxyClassLoader.java:224)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
Caused: java.lang.NoClassDefFoundError: com/osstech/dbentities/Menu
Need some code to say anything conclusively. But, seems like you have a menu configured in layer.xml called com.osstech.dbentities.Menu. That is mis-configured. when netbeans tries to instanciate this object, it can't find it.