ANTLR Plugin in eclipse

Question

sorry for my english! I install plagin in eclipse, but wen i run my little project i have this problem. Why its not work?

error(10): internal error: Can't get property indirectDelegates using method get/isIndirectDelegates from org.antlr.tool.Grammar instance : java.lang.NullPointerException java.util.Objects.requireNonNull(Unknown Source) java.util.ArrayList.removeAll(Unknown Source) org.antlr.tool.CompositeGrammar.getIndirectDelegates(CompositeGrammar.java:222) org.antlr.tool.Grammar.getIndirectDelegates(Grammar.java:2620) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) java.lang.reflect.Method.invoke(Unknown Source) org.antlr.stringtemplate.language.ASTExpr.invokeMethod(ASTExpr.java:564) org.antlr.stringtemplate.language.ASTExpr.rawGetObjectProperty(ASTExpr.java:515) org.antlr.stringtemplate.language.ASTExpr.getObjectProperty(ASTExpr.java:417) org.antlr.stringtemplate.language.ActionEvaluator.attribute(ActionEvaluator.java:351) org.antlr.stringtemplate.language.ActionEvaluator.expr(ActionEvaluator.java:136) org.antlr.stringtemplate.language.ActionEvaluator.templateApplication(ActionEvaluator.java:216) org.antlr.stringtemplate.language.ActionEvaluator.expr(ActionEvaluator.java:126) org.antlr.stringtemplate.language.ActionEvaluator.action(ActionEvaluator.java:84) org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:149) org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:705) org.antlr.stringtemplate.language.ASTExpr.writeTemplate(ASTExpr.java:750) org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:680) org.antlr.stringtemplate.language.ASTExpr.writeAttribute(ASTExpr.java:660) org.antlr.stringtemplate.language.ActionEvaluator.action(ActionEvaluator.java:86) org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:149) org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:705) org.antlr.stringtemplate.language.ASTExpr.writeTemplate(ASTExpr.java:750) org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:680) org.antlr.stringtemplate.language.ASTExpr.writeAttribute(ASTExpr.java:660) org.antlr.stringtemplate.language.ActionEvaluator.action(ActionEvaluator.java:86) org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:149) org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:705) org.antlr.stringtemplate.language.ASTExpr.writeTemplate(ASTExpr.java:750) org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:680) org.antlr.stringtemplate.language.ASTExpr.writeAttribute(ASTExpr.java:660) org.antlr.stringtemplate.language.ActionEvaluator.action(ActionEvaluator.java:86) org.antlr.stringtemplate.language.ASTExpr.write(ASTExpr.java:149) org.antlr.stringtemplate.StringTemplate.write(StringTemplate.java:705) org.antlr.codegen.CodeGenerator.write(CodeGenerator.java:1281) org.antlr.codegen.Target.genRecognizerFile(Target.java:94) org.antlr.codegen.CodeGenerator.genRecognizer(CodeGenerator.java:466) org.antlr.Tool.generateRecognizer(Tool.java:641) org.antlr.Tool.process(Tool.java:454)

Answer 1

ANTLR 3 produces this message when used with Java 8. However, it doesn't seem to affect the actual output. Until the fix is released in a new version of ANTLR 3, you can either ignore the message, or use Java 7.

Related issue:
#151: NPE in CompositeGrammer.getIndirectDelegates in Java 8