[jboss-jira] [JBoss JIRA] Closed: (JASSIST-41) javassist.expr.NewExpr.replace(...) fails if created object is not assigned to variable

javassist.expr.NewExpr.replace(...) fails if created object is not assigned to variable --------------------------------------------------------------------------------------- Key: JASSIST-41 URL: http://jira.jboss.com/jira/browse/JASSIST-41 Project: Javassist Issue Type: Bug Environment: Eclipse Reporter: Martin Burger Assigned To: Shigeru Chiba I implemented a ExprEditor that replaces new expressions. However, if the editor should replace a constructor call whose return value (the newly created object) is not assigned to a local variable, the method javassist.expr.NewExpr.canReplace(...) throws a CannotCompileException "sorry, cannot edit NEW followed by no DUP". The constructor has one parameter of type String, the method looks like that one: public void trigger() { new C("some string"); } In the byte code (Eclipse compiler) of the method that contains that constructor call is a LDC before the expected INVOKESPECIAL, so the method canReplace(...) fails: NEW C LDC "some string" INVOKESPECIAL C.<init>(Ljava/lang/String;)V If I add an assignment, there will be a DUP before the LDC: public void trigger() { C c = new C("some string"); } NEW C DUP LDC "some string" INVOKESPECIAL C.<init>(Ljava/lang/String;)V