COMPILER BUG! REPORT THIS IMMEDIATELY

[frank-montyne]

I have the following reduced my problem to the foillowing simple script:

import java.util.List;

List aList = [];
for (int index = 0; index < 96; index++) {
	aList.add(index);
}
			
for (int index = 0; index < aList.size(); index++) {
	a = aList[index];
	System.out.println(a);
}

a = aList[index]; fails with a compiler bug the moment the index is equal to 51. Until then everything is fine. I have no idea why. If I use a = aList.get(index); then I get no error.

Any idea what is going on here?
I am running on Java 21 with the latest version of MVEL.

**** COMPILER BUG! REPORT THIS IMMEDIATELY AT http://jira.codehaus.org/browse/MVEL
Expression: import java.util.List;

List aList = [];
for (int index = 0; index < 96; index++) {
	aList.add(index);
}

for (int index = 0; index < aList.size(); index++) {
	a = aList[index];
	System.out.println(a);
}

2024-02-08 15:05:04.182Z n/a|n/a|n/a|n/a|n/a|n/a|[qtp557037330-108]|ERROR|c.b.s.s.r.m.JerseyExceptionMapper Jersey exception
java.lang.VerifyError: Bad type on operand stack
Exception Details:
Location:
ASMAccessorImpl_136247507217074047041735.getValue(Ljava/lang/Object;Ljava/lang/Object;Lorg/mvel2/integration/VariableResolverFactory;)Ljava/lang/Object; @27: invokeinterface
Reason:
Type 'java/lang/Object' (current frame, stack[1]) is not assignable to integer
Current Frame:
bci: @27
flags: { }
locals: { 'ASMAccessorImpl_136247507217074047041735', 'java/lang/Object', 'java/lang/Object', 'org/mvel2/integration/VariableResolverFactory' }
stack: { 'java/util/List', 'java/lang/Object' }
Bytecode:
0000000: 2d12 0eb9 0014 0200 b900 1901 00c0 001b
0000010: 2ab4 001f 2c2d b900 2403 00b9 0028 0200
0000020: b0

at java.base/java.lang.Class.getDeclaredConstructors0(Native Method)
at java.base/java.lang.Class.privateGetDeclaredConstructors(Class.java:3549)
at java.base/java.lang.Class.getConstructor0(Class.java:3754)
at java.base/java.lang.Class.getConstructor(Class.java:2442)
at org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer._initializeAccessor(ASMAccessorOptimizer.java:830)
at org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer.compileAccessor(ASMAccessorOptimizer.java:957)
at org.mvel2.optimizers.impl.asm.ASMAccessorOptimizer.optimizeAccessor(ASMAccessorOptimizer.java:345)
at org.mvel2.optimizers.dynamic.DynamicGetAccessor.optimize(DynamicGetAccessor.java:95)
at org.mvel2.optimizers.dynamic.DynamicGetAccessor.getValue(DynamicGetAccessor.java:65)
at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:108)
at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:38)
at org.mvel2.ast.AssignmentNode.getReducedValueAccelerated(AssignmentNode.java:116)
at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
at org.mvel2.compiler.CompiledExpression.getDirectValue(CompiledExpression.java:115)
at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:111)
at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:98)
at org.mvel2.ast.ForNode.getReducedValue(ForNode.java:76)
at org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:112)
at org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:58)
at org.mvel2.MVEL.eval(MVEL.java:142)
at com.bynubian.scriptengine.mvel.MVELEngine$Evaluator.execute(MVELEngine.java:137)
at com.bynubian.scriptengine.AbstractScriptEngine$Evaluator.execute(AbstractScriptEngine.java:362)
at com.bynubian.shared.entities.resource.ScriptingResource.execute(ScriptingResource.java:272)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:52)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:146)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:189)
at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$ResponseOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:176)
at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:93)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:478)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:400)
at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:81)
at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:261)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:248)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:244)
at org.glassfish.jersey.internal.Errors.process(Errors.java:292)
at org.glassfish.jersey.internal.Errors.process(Errors.java:274)
at org.glassfish.jersey.internal.Errors.process(Errors.java:244)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:265)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:240)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:697)
at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:394)
at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:346)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:357)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:311)
at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:205)
at org.eclipse.jetty.ee10.servlet.ServletHolder.handle(ServletHolder.java:736)
at org.eclipse.jetty.ee10.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1614)
at org.eclipse.jetty.ee10.servlet.ServletHandler$MappedServlet.handle(ServletHandler.java:1547)
at org.eclipse.jetty.ee10.servlet.ServletChannel.dispatch(ServletChannel.java:797)
at org.eclipse.jetty.ee10.servlet.ServletChannel.handle(ServletChannel.java:428)
at org.eclipse.jetty.ee10.servlet.ServletHandler.handle(ServletHandler.java:464)
at org.eclipse.jetty.ee10.servlet.SessionHandler.handle(SessionHandler.java:703)
at org.eclipse.jetty.server.handler.ContextHandler.handle(ContextHandler.java:761)
at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:594)
at org.eclipse.jetty.server.Server.handle(Server.java:179)
at org.eclipse.jetty.server.internal.HttpChannelState$HandlerInvoker.run(HttpChannelState.java:594)
at org.eclipse.jetty.server.internal.HttpConnection.onFillable(HttpConnection.java:424)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:322)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:99)
at org.eclipse.jetty.io.SelectableChannelEndPoint$1.run(SelectableChannelEndPoint.java:53)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:478)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:441)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:293)
at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.run(AdaptiveExecutionStrategy.java:201)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:410)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:971)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.doRunJob(QueuedThreadPool.java:1201)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1156)
at java.base/java.lang.Thread.run(Thread.java:1583)