[jboss-jira] [JBoss JIRA] Created: (JBRULES-3014) Too many error messages (and stack dumps!) due to simple syntax error

[Wolfgang Laun (JIRA)]

Too many error messages (and stack dumps!) due to simple syntax error
---------------------------------------------------------------------

                 Key: JBRULES-3014
                 URL: https://issues.jboss.org/browse/JBRULES-3014
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-compiler (expert)
    Affects Versions: 5.2.0.M2
            Reporter: Wolfgang Laun
            Assignee: Mark Proctor
             Fix For: 5.2.0.CR1


Person( age > ($age * 2) ) )  ### typo - note the redundant ')'

This produces nested Empty Stack and Class Cast Exceptions, lots of stack dumps and three error messages:

[0,0]: Line 30:0 unexpected exception at input 'rule'. Exception: java.util.EmptyStackException. Stack trace:
 java.util.EmptyStackException
	at java.util.Stack.peek(Stack.java:85)
	at java.util.Stack.pop(Stack.java:67)
	at org.drools.lang.ParserHelper.popParaphrases(ParserHelper.java:409)
	at org.drools.lang.ParserHelper.end(ParserHelper.java:723)
	at org.drools.lang.DRLParser.rule(DRLParser.java:915)
	at org.drools.lang.DRLParser.statement(DRLParser.java:248)
	at org.drools.lang.DRLParser.compilationUnit(DRLParser.java:143)
	at org.drools.compiler.DrlParser.compile(DrlParser.java:225)
	at org.drools.compiler.DrlParser.parse(DrlParser.java:136)
	at org.drools.compiler.DrlParser.parse(DrlParser.java:141)
	at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:307)
	at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:486)
	at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
	at express.Main.setup(Main.java:48)
	at express.Main.main(Main.java:92)

[0,0]: Line 31:8 unexpected exception at input '"mvel"'. Exception: java.lang.ClassCastException: org.drools.lang.api.CEDescrBuilderImpl cannot be cast to org.drools.lang.api.AttributeSupportBuilder. Stack trace:
 java.lang.ClassCastException: org.drools.lang.api.CEDescrBuilderImpl cannot be cast to org.drools.lang.api.AttributeSupportBuilder
	at org.drools.lang.ParserHelper.start(ParserHelper.java:667)
	at org.drools.lang.DRLParser.stringAttribute(DRLParser.java:1294)
	at org.drools.lang.DRLParser.attribute(DRLParser.java:1073)
	at org.drools.lang.DRLParser.statement(DRLParser.java:257)
	at org.drools.lang.DRLParser.compilationUnit(DRLParser.java:143)
	at org.drools.compiler.DrlParser.compile(DrlParser.java:225)
	at org.drools.compiler.DrlParser.parse(DrlParser.java:136)
	at org.drools.compiler.DrlParser.parse(DrlParser.java:141)
	at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:307)
	at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:486)
	at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
	at express.Main.setup(Main.java:48)
	at express.Main.main(Main.java:92)

[31,8]: [ERR 107] Line 31:8 mismatched input '"mvel"' expecting one of the following tokens: '[package, import, global, declare, function, rule, query]'.
[0,0]: Line 39:0 unexpected exception at input 'rule'. Exception: java.util.EmptyStackException. Stack trace:
 java.util.EmptyStackException
	at java.util.Stack.peek(Stack.java:85)
	at java.util.Stack.pop(Stack.java:67)
	at org.drools.lang.ParserHelper.popParaphrases(ParserHelper.java:409)
	at org.drools.lang.ParserHelper.end(ParserHelper.java:723)
	at org.drools.lang.DRLParser.rule(DRLParser.java:915)
	at org.drools.lang.DRLParser.statement(DRLParser.java:248)
	at org.drools.lang.DRLParser.compilationUnit(DRLParser.java:143)
	at org.drools.compiler.DrlParser.compile(DrlParser.java:225)
	at org.drools.compiler.DrlParser.parse(DrlParser.java:136)
	at org.drools.compiler.DrlParser.parse(DrlParser.java:141)
	at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:307)
	at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:486)
	at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
	at express.Main.setup(Main.java:48)
	at express.Main.main(Main.java:92)


--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira