Hello,
I have a project, that uses Drools 5.0.1. I have a class, called
RuleFlowProcessor, that's used to apply some of my rules to the objects.
The instances of RuleFlowProcessor with the identical configuration should be
used by different threads, and i use following mechanism:
I initialize one instance of RuleFlowProcessor, and the threads take copy of
this instance, calling the 'clone()' method, which is not synchronized, and in
which I just create new instance of
RuleFlowProcessor and init it, using the same data.
And therefore I get an exception:
Exception in thread "Thread-91" [Error: incomplete statement: (possible use of
reserved keyword as identifier: )]
[Near : {... globals != empt ....}]
^
[Line: 0, Column: 0]
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:153)
at
org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:44)
at org.mvel2.MVEL.eval(MVEL.java:514)
although, all the resources (.drl and .rf files) are parsed perfectly, when I
use just one thread.
In actions of my ruleflow, the dialect: 'mvel' was set by default, if I set
dialect to 'java' without modifying any code, the error doesn't occur.
The full stacktrace is in attach. I can send the project, that reproduces the
problem, if needed.
Best regards,
Grigoriy Grigoriev.
Exception in thread "Thread-91" [Error: incomplete statement: (possible use of
reserved keyword as identifier: )]
[Near : {... globals != empt ....}]
^
[Line: 0, Column: 0]
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:153)
at
org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:44)
at org.mvel2.MVEL.eval(MVEL.java:514)
at org.mvel2.templates.res.IfNode.eval(IfNode.java:61)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
at org.mvel2.templates.res.ForEachNode.eval(ForEachNode.java:116)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.IfNode.eval(IfNode.java:62)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:195)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:190)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:180)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:169)
at
org.drools.rule.builder.dialect.java.AbstractJavaRuleBuilder.generatTemplates(AbstractJavaRuleBuilder.java:126)
at
org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:128)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:86)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1159)
at
org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:649)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:290)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:488)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)
at com.myfirm.RuleFlowProcess.init(RuleFlowProcess.java:22)
at com.myfirm.RuleFlowProcess.clone(RuleFlowProcess.java:48)
at com.myfirm.ThreadTest$CloneThread.run(ThreadTest.java:35)
Caused by: java.lang.NullPointerException
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:113)
... 28 more
Exception in thread "Thread-32" java.lang.RuntimeException: [-1,-1]: Process
'flow' [sayHello]: Process has no end node.
at com.myfirm.RuleFlowProcess.init(RuleFlowProcess.java:33)
at com.myfirm.RuleFlowProcess.clone(RuleFlowProcess.java:48)
at com.myfirm.ThreadTest$CloneThread.run(ThreadTest.java:35)
Exception in thread "Thread-54" [Error: incomplete statement: (possible use of
reserved keyword as identifier: )]
[Near : {... declarations != empt ....}]
^
[Line: 0, Column: 0]
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:153)
at
org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:44)
at org.mvel2.MVEL.eval(MVEL.java:514)
at org.mvel2.templates.res.IfNode.eval(IfNode.java:61)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:195)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:190)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:180)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:169)
at
org.drools.rule.builder.dialect.java.AbstractJavaRuleBuilder.generatTemplates(AbstractJavaRuleBuilder.java:126)
at
org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:128)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:86)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1159)
at
org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:649)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:290)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:488)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)
at com.myfirm.RuleFlowProcess.init(RuleFlowProcess.java:24)
at com.myfirm.RuleFlowProcess.clone(RuleFlowProcess.java:48)
at com.myfirm.ThreadTest$CloneThread.run(ThreadTest.java:35)
Caused by: java.lang.NullPointerException
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:113)
... 21 more
Exception in thread "Thread-28" [Error: incomplete statement: (possible use of
reserved keyword as identifier: )]
[Near : {... globals != empt ....}]
^
[Line: 0, Column: 0]
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:153)
at
org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:44)
at org.mvel2.MVEL.eval(MVEL.java:514)
at org.mvel2.templates.res.IfNode.eval(IfNode.java:61)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
at org.mvel2.templates.res.ForEachNode.eval(ForEachNode.java:116)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.IfNode.eval(IfNode.java:62)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:195)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:190)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:180)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:169)
at
org.drools.rule.builder.dialect.java.AbstractJavaRuleBuilder.generatTemplates(AbstractJavaRuleBuilder.java:126)
at
org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:128)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:86)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1159)
at
org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:649)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:290)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:488)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)
at com.myfirm.RuleFlowProcess.init(RuleFlowProcess.java:25)
at com.myfirm.RuleFlowProcess.clone(RuleFlowProcess.java:48)
at com.myfirm.ThreadTest$CloneThread.run(ThreadTest.java:35)
Caused by: java.lang.NullPointerException
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:113)
... 28 more
Exception in thread "Thread-64" [Error: incomplete statement: (possible use of
reserved keyword as identifier: )]
[Near : {... declarations != empt ....}]
^
[Line: 0, Column: 0]
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:153)
at
org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:44)
at org.mvel2.MVEL.eval(MVEL.java:514)
at org.mvel2.templates.res.IfNode.eval(IfNode.java:61)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
at org.mvel2.templates.res.ForEachNode.eval(ForEachNode.java:116)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
at org.mvel2.templates.res.ForEachNode.eval(ForEachNode.java:116)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:195)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:190)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:180)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:169)
at
org.drools.rule.builder.dialect.java.AbstractJavaRuleBuilder.generatTemplates(AbstractJavaRuleBuilder.java:135)
at
org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:128)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:86)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1159)
at
org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:649)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:290)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:488)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)
at com.myfirm.RuleFlowProcess.init(RuleFlowProcess.java:24)
at com.myfirm.RuleFlowProcess.clone(RuleFlowProcess.java:48)
at com.myfirm.ThreadTest$CloneThread.run(ThreadTest.java:35)
Caused by: java.lang.NullPointerException
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:113)
... 33 more
Exception in thread "Thread-72" [Error: incomplete statement: (possible use of
reserved keyword as identifier: )]
[Near : {... globals != empt ....}]
^
[Line: 0, Column: 0]
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:153)
at
org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:44)
at org.mvel2.MVEL.eval(MVEL.java:514)
at org.mvel2.templates.res.IfNode.eval(IfNode.java:61)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
at org.mvel2.templates.res.ForEachNode.eval(ForEachNode.java:116)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.IfNode.eval(IfNode.java:62)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
at org.mvel2.templates.res.ForEachNode.eval(ForEachNode.java:116)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.TerminalNode.eval(TerminalNode.java:39)
at org.mvel2.templates.res.ForEachNode.eval(ForEachNode.java:116)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:195)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:190)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:180)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:169)
at
org.drools.rule.builder.dialect.java.AbstractJavaRuleBuilder.generatTemplates(AbstractJavaRuleBuilder.java:135)
at
org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:128)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:86)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1159)
at
org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:649)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:290)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:488)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)
at com.myfirm.RuleFlowProcess.init(RuleFlowProcess.java:25)
at com.myfirm.RuleFlowProcess.clone(RuleFlowProcess.java:48)
at com.myfirm.ThreadTest$CloneThread.run(ThreadTest.java:35)
Caused by: java.lang.NullPointerException
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:113)
... 40 more
Exception in thread "Thread-12" [Error: incomplete statement: (possible use of
reserved keyword as identifier: )]
[Near : {... declarations != empt ....}]
^
[Line: 0, Column: 0]
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:153)
at
org.mvel2.MVELInterpretedRuntime.parse(MVELInterpretedRuntime.java:44)
at org.mvel2.MVEL.eval(MVEL.java:514)
at org.mvel2.templates.res.IfNode.eval(IfNode.java:61)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.res.ExpressionNode.eval(ExpressionNode.java:53)
at org.mvel2.templates.res.TextNode.eval(TextNode.java:46)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:195)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:190)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:180)
at org.mvel2.templates.TemplateRuntime.execute(TemplateRuntime.java:169)
at
org.drools.rule.builder.dialect.java.AbstractJavaRuleBuilder.generatTemplates(AbstractJavaRuleBuilder.java:126)
at
org.drools.rule.builder.dialect.java.JavaConsequenceBuilder.build(JavaConsequenceBuilder.java:128)
at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:86)
at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:1159)
at
org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:649)
at
org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:290)
at
org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:488)
at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:25)
at com.myfirm.RuleFlowProcess.init(RuleFlowProcess.java:25)
at com.myfirm.RuleFlowProcess.clone(RuleFlowProcess.java:48)
at com.myfirm.ThreadTest$CloneThread.run(ThreadTest.java:35)
Caused by: java.lang.NullPointerException
at
org.mvel2.MVELInterpretedRuntime.parseAndExecuteInterpreted(MVELInterpretedRuntime.java:113)
... 21 more
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