JBossModules plugin issue
Hello
I have used the JBossModules plugin for Byteman to allow rules to IMPORT a custom JBoss Modules module and its HELPER class to do some manipulations of Wildfly's JGroups and Infinispan classes. The rules work as expected, except in the case of one rule, which is throwing ClassNotFoundException on classes imported by the module. I'm kind of mystified, as it works for the other rules in the rule set:
The rule set looks like this:
###########################################################
# Rules for minitoring ThreadPoolExecutors
###########################################################
IMPORT org.wildfly.byteman.rule.helper.threadpool
HELPER org.wildfly.byteman.rule.helper.threadpool.PeriodicJGroupsThreadPoolHelper
RULE TP_init
CLASS org.jgroups.protocols.TP
METHOD void init()
AT EXIT
IF TRUE
DO
# thread pools are created in TP.init
System.out.println("[BYTEMAN]: Adding executors for TP: " + $0 + " with regular = " + $0.getDefaultThreadPool() + ", OOB = " + $0.getOOBThreadPool() + ", internal = " + $0.getInternalThreadPool());
addTransportThreadPoolsToMap($0);
ENDRULE
RULE JGroups periodic helper hook
CLASS org.wildfly.byteman.rule.helper.threadpool.JGroupsPeriodicHelper
METHOD periodicTrigger
AT ENTRY
IF TRUE
DO
System.out.println("[BYTEMAN-P] periodicTrigger called by thread");
System.out.println(dumpStatsForExecutorInMap()) ;
ENDRULE
RULE TP_destroy
CLASS org.jgroups.protocols.TP
METHOD destroy
AT ENTRY
IF TRUE
DO
System.out.println("[BYTEMAN]: Calling destroy for TP: " + $0);
removeTransportThreadPoolsFromMap($0)
ENDRULE
RULE RejectedExecutionException_throw_jgroups
CLASS java.util.concurrent.RejectedExecutionException
METHOD <init>
AT ENTRY
BIND
executor:ThreadPoolExecutor = $0;
IF TRUE
DO
System.out.println("[BYTEMAN]: JGroups throwing RejectedExecutionException for executor " + $0);
ENDRULE
and the stack trace on the exception looks like this:
[JBossINF] 13:37:39,783 ERROR [org.jgroups.protocols.UDP] (unicast receiver,ee,perf32) failed receiving packet: java.lang.NoClassDefFoundError: org/jgroups/protocols/TP [JBossINF] at java.lang.Class.getDeclaredMethods0(Native Method) [JBossINF] at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) [JBossINF] at java.lang.Class.privateGetMethodRecursive(Class.java:3048) [JBossINF] at java.lang.Class.getMethod0(Class.java:3018) [JBossINF] at java.lang.Class.getMethod(Class.java:1784) [JBossINF] at org.jboss.byteman.agent.HelperManager.lookupLifecycleMethod(HelperManager.java:319) [JBossINF] at org.jboss.byteman.agent.HelperManager.getDetails(HelperManager.java:286) [JBossINF] at org.jboss.byteman.agent.HelperManager.installed(HelperManager.java:65) [JBossINF] at org.jboss.byteman.rule.Rule.installed(Rule.java:915) [JBossINF] at org.jboss.byteman.rule.Rule.ensureTypeCheckedCompiled(Rule.java:490) [JBossINF] at org.jboss.byteman.rule.Rule.execute(Rule.java:705) [JBossINF] at org.jboss.byteman.rule.Rule.execute(Rule.java:686) [JBossINF] at java.util.concurrent.RejectedExecutionException.<init>(RejectedExecutionException.java:65) [JBossINF] at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:2047) [JBossINF] at org.jgroups.util.ShutdownRejectedExecutionHandler.rejectedExecution(ShutdownRejectedExecutionHandler.java:33) [JBossINF] at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:823) [JBossINF] at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1369) [JBossINF] at org.jgroups.protocols.TP.handleSingleMessage(TP.java:1697) [JBossINF] at org.jgroups.protocols.TP.receive(TP.java:1630) [JBossINF] at org.jgroups.protocols.UDP$PacketReceiver.run(UDP.java:691) [JBossINF] at java.lang.Thread.run(Thread.java:745) [JBossINF] Caused by: java.lang.ClassNotFoundException: org.jgroups.protocols.TP [JBossINF] at java.net.URLClassLoader.findClass(URLClassLoader.java:381) [JBossINF] at java.lang.ClassLoader.loadClass(ClassLoader.java:424) [JBossINF] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) [JBossINF] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) [JBossINF] ... 21 more [JBossINF]
The class is not found, however the other rules are triggered by that class and the module definition for the module org.wildfly.byteman.rule.helper.threadpool includes the JGroups jar as an import:
<module xmlns="urn:jboss:module:1.1" name="org.wildfly.byteman.rule.helper.threadpool">
<resources>
<resource-root path="${project.build.finalName}.jar"/>
</resources>
<dependencies>
<module name="org.infinispan"/>
<module name="org.jgroups"/>
<module name="org.apache.log4j"/>
</dependencies>
</module>
org.wildfly.byteman.rule.helper.threadpool
Before I start digging, any ideas?
