ClassNotFoundException only depends on the JDK7 update version?

Question

ClassNotFoundException only depends on the JDK7 update version?

I inherited the JBOSS 4.2.3.GA project. ear

where everything loads and works fine if I build it with JDK 7u45, but Jboss Bootstrap doesn't load and run early on if I build it with any new JDK 7 update (e.g. 7u76, 7u79, 7u80).

The JBOSS server itself runs on Java 1.7.0_45.

The logged reason for the failure is a ClassNofFoundException for a class that actually exists (even for a failed .ear):

log4j:ERROR Could not create the Layout. Reported error follows.
java.lang.ClassNotFoundException: dbs.common.logger.CsvLayout
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:190)
        at org.apache.log4j.helpers.Loader.loadClass(Loader.java:178)
        at org.apache.log4j.xml.DOMConfigurator.parseLayout(DOMConfigurator.java:555)
        at org.apache.log4j.xml.DOMConfigurator.parseAppender(DOMConfigurator.java:269)
        at org.apache.log4j.xml.DOMConfigurator.findAppenderByName(DOMConfigurator.java:176)
        at org.apache.log4j.xml.DOMConfigurator.findAppenderByReference(DOMConfigurator.java:191)
        at org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement(DOMConfigurator.java:523)
        at org.apache.log4j.xml.DOMConfigurator.parseCategory(DOMConfigurator.java:436)
        at org.apache.log4j.xml.DOMConfigurator.parse(DOMConfigurator.java:999)
        at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:867)
        at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:773)
        at org.apache.log4j.xml.DOMConfigurator.configure(DOMConfigurator.java:901)
        at org.jboss.logging.Log4jService$URLWatchTimerTask.reconfigure(Log4jService.java:643)
        at org.jboss.logging.Log4jService$URLWatchTimerTask.run(Log4jService.java:582)
        at org.jboss.logging.Log4jService.setup(Log4jService.java:460)
        at org.jboss.logging.Log4jService.createService(Log4jService.java:476)
        at org.jboss.system.ServiceMBeanSupport.jbossInternalCreate(ServiceMBeanSupport.java:260)
        at org.jboss.system.ServiceMBeanSupport.jbossInternalLifecycle(ServiceMBeanSupport.java:243)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
        at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
        at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
        at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
        at org.jboss.system.ServiceController$ServiceProxy.invoke(ServiceController.java:978)
        at com.sun.proxy.$Proxy0.create(Unknown Source)
        at org.jboss.system.ServiceController.create(ServiceController.java:330)
        at org.jboss.system.ServiceController.create(ServiceController.java:273)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:86)
        at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
        at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
        at com.sun.proxy.$Proxy4.create(Unknown Source)
        at org.jboss.deployment.SARDeployer.create(SARDeployer.java:260)
        at org.jboss.deployment.MainDeployer.create(MainDeployer.java:969)
        at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:818)
        at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:782)
        at org.jboss.deployment.MainDeployer.deploy(MainDeployer.java:766)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:155)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:94)
        at org.jboss.mx.interceptor.AbstractInterceptor.invoke(AbstractInterceptor.java:133)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
        at org.jboss.mx.interceptor.ModelMBeanOperationInterceptor.invoke(ModelMBeanOperationInterceptor.java:142)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:88)
        at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:264)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:659)
        at org.jboss.mx.util.MBeanProxyExt.invoke(MBeanProxyExt.java:210)
        at com.sun.proxy.$Proxy5.deploy(Unknown Source)
        at org.jboss.system.server.ServerImpl.doStart(ServerImpl.java:482)
        at org.jboss.system.server.ServerImpl.start(ServerImpl.java:362)
        at org.jboss.Main.boot(Main.java:200)
        at org.jboss.Main$1.run(Main.java:508)
        at java.lang.Thread.run(Thread.java:744)

Normally I would easily find the real cause of the ClassNofFoundException, but this time I am puzzled given the following facts:

The entire environment (including CLASSPATH !) Is .ear

identical for .
The aforementioned "not found class" dbs.common.logger.CsvLayout is in the common.jar file in exactly the same way it should be.
There are no errors in the assembly.
On another development workstation (same Eclipse, etc.) that .ear

with JDK 7u79 (i.e. a later update than 7u45) results in a .ear that downloads and runs correctly (on the same server and in environment).

What can explain such a ClassNofFoundException?

What am I missing?

Update: Comparison of "not found" CsvLayout.class between working and non-working common.jar file shows that there is a major_version difference in class file format . Worker has 0x33

(Java SE 7), crash has 0x34

(Java SE 8).

I've tried to always work with runtimes that are only jre7. How did this one slip 0x34

?

+2

java classnotfoundexception jboss log4j ear

datv May 30 '17 at 7:47

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1 answer

PJMeisch · Accepted Answer · 2017-06-01T09:58:41+0000

The problem arises because the common.jar: library is built using java 8 without specifying the target version of the class, and so a jar file with the versions of the java 8 file is generated.

To create a Java 7 class with Java 8 you need

pure java compilation: add target option javac -target 1.7 <javafile>
maven: add property <maven.compiler.target>1.7</maven.compiler.target>
ant: add <property name="ant.build.javac.source" value="1.7"/> <property name="ant.build.javac.target" value="1.7"/>

to your build.xml file

ClassNotFoundException only depends on the JDK7 update version?

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