java.lang.ClassNotFoundException: org.mvel2.compiler.Accessor

In Mvel 2.4.3 on WildFly 16/Open JDK 11 we observe that


java.lang.ClassNotFoundException: org.mvel2.compiler.Accessor
	at java.base/java.lang.ClassLoader.findClass(ClassLoader.java:718)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
	at java.base/java.lang.ClassLoader.defineClass1(Native Method)
	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
	at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:877)
	at org.mvel//org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer$ContextClassLoader.defineClass(ASMAccessorOptimizer.java:2245)
	at org.mvel//org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer.loadClass(ASMAccessorOptimizer.java:2254)
	at org.mvel//org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer._initializeAccessor(ASMAccessorOptimizer.java:750)
	at org.mvel//org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer.optimizeSetAccessor(ASMAccessorOptimizer.java:665)
	at org.mvel//org.mvel2.optimizers.dynamic.DynamicSetAccessor.optimize(DynamicSetAccessor.java:83)
	at org.mvel//org.mvel2.optimizers.dynamic.DynamicSetAccessor.setValue(DynamicSetAccessor.java:60)
	at org.mvel//org.mvel2.compiler.CompiledAccExpression.setValue(CompiledAccExpression.java:59)
	at org.mvel//org.mvel2.ast.DeepAssignmentNode.getReducedValueAccelerated(DeepAssignmentNode.java:90)
	at org.mvel//org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:42)
	at org.mvel//org.mvel2.MVEL.executeExpression(MVEL.java:968)

Issue Analytics

State:
Created 4 years ago
Comments:5 (2 by maintainers)

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abykuruvilla-devcommented, Jan 16, 2022

@MalcolmOdd sure. It strangely happens for certain templates and only after deployment. Because of company policy reasons I can’t share the exact code. But we use orbs and mostly like this

String templateStr="@{AmountValidation.isNonNegative(row.get(\"totalAmount\"))}";
CompiledTemplate=TemplateCompiler.compile(templateStr);
...........
//Following line gets executed in multiple threads.
Object result=TemplateRuntime.execute(template,null,factory);

We provide the variables using VariableResolverFactory. Attached the stacktrace

Caused by: java.lang.NoClassDefFoundError: null
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:na]
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:na]
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:na]
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490) ~[na:na]
at java.base/java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:603) ~[na:na]
... 72 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/mvel2/compiler/Accessor
at java.base/java.lang.ClassLoader.defineClass1(Native Method) ~[na:na]
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017) ~[na:na]
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:878) ~[na:na]
at org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer$ContextClassLoader.defineClass(ASMAccessorOptimizer.java:2311) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer.loadClass(ASMAccessorOptimizer.java:2322) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer._initializeAccessor(ASMAccessorOptimizer.java:814) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer.compileAccessor(ASMAccessorOptimizer.java:957) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer.optimizeAccessor(ASMAccessorOptimizer.java:345) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.optimizers.dynamic.DynamicGetAccessor.optimize(DynamicGetAccessor.java:95) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.optimizers.dynamic.DynamicGetAccessor.getValue(DynamicGetAccessor.java:65) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.ast.Union.getReducedValueAccelerated(Union.java:39) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.ast.Or.getReducedValueAccelerated(Or.java:34) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:42) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.MVEL.executeExpression(MVEL.java:945) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.templates.res.CompiledTerminalExpressionNode.eval(CompiledTerminalExpressionNode.java:39) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:285) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:247) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:255) ~[mvel2-2.4.12.Final.jar!/:na]
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:203) ~[mvel2-2.4.12.Final.jar!/:na]
***********************remove private classes from stack trace***************************************
at java.base/java.util.concurrent.ForkJoinTask$AdaptedCallable.exec(ForkJoinTask.java:1448) ~[na:na]
at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290) ~[na:na]
at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020) ~[na:na]
at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656) ~[na:na]
at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594) ~[na:na]
at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) ~[na:na]
Caused by: java.lang.ClassNotFoundException: org.mvel2.compiler.Accessor
at java.base/java.lang.ClassLoader.findClass(ClassLoader.java:719) ~[na:na]
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589) ~[na:na]
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[na:na]
... 33 common frames omitted

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rady66commented, May 9, 2022

that was pretty back in time so i forgot how we resolved it… it could be a synchronization/timing issue where classloader-s are reset and then reverted back… a code inspection might narrow down the problem while reproducing is quite difficult