Warning in JanusGraph 1.0.0 about missing class which did not occur in 0.6.3 #4359

mrckzgl · 2024-04-03T12:26:43Z

mrckzgl
Apr 3, 2024

After upgrade from 0.6.3 to 1.0.0 we see this warning at the first query of the graph:

[Ruby-0-Thread-6: importers/lib/TaskQueueManager.rb:90] WARN org.reflections8.Reflections - could not get type for name org.apache.tinkerpop.gremlin.server.GraphManager from any class loader
org.reflections8.ReflectionsException: could not get type for name org.apache.tinkerpop.gremlin.server.GraphManager
	at org.reflections8.ReflectionUtils.forName(ReflectionUtils.java:412)
	at org.reflections8.Reflections.expandSuperTypes(Reflections.java:421)
	at org.reflections8.Reflections.<init>(Reflections.java:158)
	at org.reflections8.Reflections.<init>(Reflections.java:200)
	at org.reflections8.Reflections.<init>(Reflections.java:173)
	at org.janusgraph.graphdb.util.JanusGraphTraverserUtil.<clinit>(JanusGraphTraverserUtil.java:35)
	at org.janusgraph.graphdb.tinkerpop.optimize.step.JanusGraphMultiQueryStep.registerTraverser(JanusGraphMultiQueryStep.java:119)
	at org.janusgraph.graphdb.tinkerpop.optimize.step.JanusGraphMultiQueryStep.processNextStart(JanusGraphMultiQueryStep.java:112)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:155)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.ExpandableStepIterator.hasNext(ExpandableStepIterator.java:47)
	at org.apache.tinkerpop.gremlin.process.traversal.step.map.NoOpBarrierStep.processAllStarts(NoOpBarrierStep.java:67)
	at org.apache.tinkerpop.gremlin.process.traversal.step.map.NoOpBarrierStep.processNextStart(NoOpBarrierStep.java:56)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:155)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.ExpandableStepIterator.next(ExpandableStepIterator.java:55)
	at org.apache.tinkerpop.gremlin.process.traversal.step.map.ScalarMapStep.processNextStart(ScalarMapStep.java:39)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:155)
	at org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.hasNext(DefaultTraversal.java:192)
	at org.jruby.dist/org.jruby.javasupport.ext.JavaUtil$Iterator.each(JavaUtil.java:113)
	at org.jruby.dist/org.jruby.javasupport.ext.JavaUtil$Iterator$INVOKER$s$0$0$each.call(JavaUtil$Iterator$INVOKER$s$0$0$each.gen)
	at org.jruby.dist/org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:485)
	at org.jruby.dist/org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:210)
	at org.jruby.dist/org.jruby.RubyEnumerable.callEach(RubyEnumerable.java:87)
	at org.jruby.dist/org.jruby.RubyEnumerable.to_a(RubyEnumerable.java:453)
	at org.jruby.dist/org.jruby.RubyEnumerable$INVOKER$s$to_a.call(RubyEnumerable$INVOKER$s$to_a.gen)
	at org.jruby.dist/org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:474)
	at org.jruby.dist/org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:195)
	at org.jruby.dist/org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:350)
	at org.jruby.dist/org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:66)
	at org.jruby.dist/org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:82)
	at org.jruby.dist/org.jruby.internal.runtime.methods.InterpretedIRMethod.INTERPRET_METHOD(InterpretedIRMethod.java:204)
	at org.jruby.dist/org.jruby.internal.runtime.methods.InterpretedIRMethod.call(InterpretedIRMethod.java:191)
	at org.jruby.dist/org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:495)
	at org.jruby.dist/org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:244)
	at org.jruby.dist/org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:318)
	at org.jruby.dist/org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:66)
	at org.jruby.dist/org.jruby.ir.interpreter.InterpreterEngine.interpret(InterpreterEngine.java:76)
	at org.jruby.dist/org.jruby.internal.runtime.methods.InterpretedIRMethod.INTERPRET_METHOD(InterpretedIRMethod.java:167)
	at org.jruby.dist/org.jruby.internal.runtime.methods.InterpretedIRMethod.call(InterpretedIRMethod.java:146)
	at org.jruby.dist/org.jruby.RubyClass.finvokeWithRefinements(RubyClass.java:505)
	at org.jruby.dist/org.jruby.RubyBasicObject.send(RubyBasicObject.java:1642)
	at org.jruby.dist/org.jruby.RubyKernel.send(RubyKernel.java:2303)
	at org.jruby.dist/org.jruby.RubyKernel$INVOKER$s$send.call(RubyKernel$INVOKER$s$send.gen)
	at org.jruby.dist/org.jruby.internal.runtime.methods.JavaMethod$JavaMethodOneOrNBlock.call(JavaMethod.java:422)
	at org.jruby.dist/org.jruby.runtime.callsite.CachingCallSite.cacheAndCall(CachingCallSite.java:495)
	at org.jruby.dist/org.jruby.runtime.callsite.CachingCallSite.call(CachingCallSite.java:244)
	at org.jruby.dist/org.jruby.ir.interpreter.InterpreterEngine.processCall(InterpreterEngine.java:318)
	at org.jruby.dist/org.jruby.ir.interpreter.StartupInterpreterEngine.interpret(StartupInterpreterEngine.java:66)
	at org.jruby.dist/org.jruby.ir.interpreter.Interpreter.INTERPRET_BLOCK(Interpreter.java:116)
	at org.jruby.dist/org.jruby.runtime.InterpretedIRBlockBody.commonYieldPath(InterpretedIRBlockBody.java:135)
	at org.jruby.dist/org.jruby.runtime.IRBlockBody.call(IRBlockBody.java:66)
	at org.jruby.dist/org.jruby.runtime.IRBlockBody.call(IRBlockBody.java:58)
	at org.jruby.dist/org.jruby.runtime.Block.call(Block.java:143)
	at org.jruby.dist/org.jruby.RubyProc.call(RubyProc.java:357)
	at org.jruby.dist/org.jruby.internal.runtime.RubyRunnable.run(RubyRunnable.java:110)
	at java.base/java.lang.Thread.run(Thread.java:1589)
Caused by: java.lang.ClassNotFoundException: org.apache.tinkerpop.gremlin.server.GraphManager
	at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
	at org.reflections8.ReflectionUtils.forName(ReflectionUtils.java:410)
	... 54 more

The cuplrit seems this code:

janusgraph/janusgraph-core/src/main/java/org/janusgraph/graphdb/util/JanusGraphTraverserUtil.java

Lines 34 to 40 in ab3a801

    
           for(String packageToScan : Arrays.asList("org.apache.tinkerpop", "org.janusgraph")){ 
        
               Reflections reflections = new Reflections(packageToScan); 
        
               Set<Class<? extends Traverser>> subTypesOfTraverser = reflections.getSubTypesOf(Traverser.class); 
        
               for (Class<?> traverserType : subTypesOfTraverser) { 
        
                   addTraverserClass(traverserType); 
        
               } 
        
           }

we include the following jars and their dependencies (via lock_jar JRuby gem):

jar 'org.janusgraph:janusgraph-berkeleyje:1.0.0'
jar 'org.janusgraph:janusgraph-lucene:1.0.0'
jar 'org.slf4j:slf4j-simple:1.7.36'

This warning did not appear in version 0.6.3. I would like this to be confirmed as a bug to open an issue on the tracker.

best

FlorianHockmann · 2024-04-03T12:33:28Z

FlorianHockmann
Apr 3, 2024
Maintainer

@porunov Do you have any idea about this one? Seems like you added the mentioned code in this commit.

0 replies

mrckzgl · 2024-04-03T12:46:44Z

mrckzgl
Apr 3, 2024
Author

For completeness, this seems to be the same issue as here: #4349

0 replies

porunov · 2025-08-14T15:17:39Z

porunov
Aug 14, 2025
Maintainer

0 replies

Sunbelt Computer Software

PL/B Language Development and Support

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Warning in JanusGraph 1.0.0 about missing class which did not occur in 0.6.3 #4359

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mrckzgl Apr 3, 2024

Replies: 3 comments

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FlorianHockmann Apr 3, 2024 Maintainer

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porunov Aug 14, 2025 Maintainer

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