markasllen [https://community.jboss.org/people/markasllen] created the discussion "insertAfter yields "No such field" error" To view the discussion, visit: https://community.jboss.org/message/782421#782421 -------------------------------------------------------------- I have to edit Labels that are being defined inside the constructor of a class. Because those labels use getters and setters for the text, I decided to redefine them at the end of the constructor. public class StaticPraxMMod {       private static final String PRAXFRAME = "com.praxemu.client.graphics.widgets.PraxFrame";       public static void main(String[] args) throws Exception {            ClassPool classPool = ClassPool.getDefault();         addEVLink(classPool);       }       private static void addEVLink(ClassPool classPool) throws NotFoundException, CannotCompileException, IOException {         CtClass praxFrameClass = classPool.get(PRAXFRAME);         CtConstructor praxFrameConstructor = praxFrameClass.getConstructors()[0]/*(new CtClass[] {})*/;         //praxFrameClass.addConstructor(praxFrameConstructor);           praxFrameConstructor.insertAfter("localLabel25 = new de.matthiasmann.twl.Label(new StringBuilder().append(paramsuper.õo0000().o00000(null.Ô00000)).append(\"\").toString() + \"peanuts\");\n"                 "localLabel26 = new de.matthiasmann.twl.Label(new StringBuilder().append(paramsuper.õo0000().o00000(null.class)).append(\"\").toString() + \"peanuts\");\n" +                 "localLabel27 = new de.matthiasmann.twl.Label(new StringBuilder().append(paramsuper.õo0000().o00000(null.õ00000)).append(\"\").toString() + \"peanuts\");\n" +                 "localLabel28 = new de.matthiasmann.twl.Label(new StringBuilder().append(paramsuper.õo0000().o00000(null.ÓO0000)).append(\"\").toString() + \"peanuts\");\n" +                 "localLabel29 = new de.matthiasmann.twl.Label(new StringBuilder().append(paramsuper.õo0000().o00000(null.interface)).append(\"\").toString() + \"peanuts\");\n" +                 "localLabel25.setTheme(\"label-value\");\n" +                 "localLabel26.setTheme(\"label-value\");\n" +                 "localLabel27.setTheme(\"label-value\");\n" +                 "localLabel28.setTheme(\"label-value\");\n" +                 "localLabel29.setTheme(\"label-value\");");         //praxFrameClass.toBytecode();         praxFrameClass.writeFile(".");       } } When running it, I get this : Exception in thread "main" javassist.CannotCompileException: [source error] no such field: localLabel25     at javassist.CtBehavior.insertAfter(CtBehavior.java:873)     at javassist.CtBehavior.insertAfter(CtBehavior.java:788)     at StaticPraxMMod.addEVLink(StaticPraxMMod.java:27)     at StaticPraxMMod.main(StaticPraxMMod.java:18) Caused by: compile error: no such field: localLabel25     at javassist.compiler.TypeChecker.fieldAccess(TypeChecker.java:819)     at javassist.compiler.TypeChecker.atFieldAssign(TypeChecker.java:271)     at javassist.compiler.JvstTypeChecker.atFieldAssign(JvstTypeChecker.java:84)     at javassist.compiler.TypeChecker.atAssignExpr(TypeChecker.java:230)     at javassist.compiler.ast.AssignExpr.accept(AssignExpr.java:39)     at javassist.compiler.CodeGen.doTypeCheck(CodeGen.java:242)     at javassist.compiler.CodeGen.atStmnt(CodeGen.java:330)     at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)     at javassist.compiler.Javac.compileStmnt(Javac.java:569)     at javassist.CtBehavior.insertAfterAdvice(CtBehavior.java:888)     at javassist.CtBehavior.insertAfter(CtBehavior.java:847) I tried adding the full package path to labels but it doesn't change a thing. I had the same issue with Label when I did "de.matthiasmann.twl.Label localLabel25 = new de.matthiasmann.twl.Label[...]" with and without the full package path. I would also like to know if injecting something like localLabel25.setText(localLabel25.getText().append(\" peanuts\")); would work. Thanks for your help. -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/782421#782421] Start a new discussion in Javassist at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]