#vulnerable code 
                                private Object getWithProperty(Object ctx) {
        assert debug("\n  ** ENTER -> {with}");

        if (first) {
            assert debug("ALOAD 1");
            mv.visitVarInsn(ALOAD, 1);
            first = false;
        }

        String root = new String(expr, 0, cursor - 1).trim();

        int start = cursor + 1;
        int[] res = balancedCaptureWithLineAccounting(expr, cursor, '{');
        cursor = res[0];
        (pCtx = getParserContext()).incrementLineCount(res[1]);

        this.returnType = ctx != null ? ctx.getClass() : null;

        for (WithStatementPair aPvp : parseWithExpressions(root, subset(expr, start, cursor++ - start))) {
            assert debug("DUP");
            mv.visitInsn(DUP);
            if (aPvp.getParm() == null) {
                // Execute this interpretively now.
                MVEL.eval(aPvp.getValue(), ctx, variableFactory);

                addSubstatement((ExecutableStatement) subCompileExpression(aPvp.getValue().toCharArray()));
            }
            else {
                // Execute interpretively.
                MVEL.setProperty(ctx, aPvp.getParm(), MVEL.eval(aPvp.getValue(), ctx, variableFactory));
                compiledInputs.add(((ExecutableStatement) MVEL.compileSetExpression(aPvp.getParm(),
                        getReturnType(ingressType, aPvp.getParm(), pCtx), pCtx)));

                assert debug("ALOAD 0");
                mv.visitVarInsn(ALOAD, 0);

                assert debug("GETFIELD p" + (compiledInputs.size() - 1));
                mv.visitFieldInsn(GETFIELD, className, "p" + (compiledInputs.size() - 1), "L" + NAMESPACE + "compiler/ExecutableStatement;");

                assert debug("ALOAD 1");
                mv.visitVarInsn(ALOAD, 1);

                assert debug("ALOAD 2");
                mv.visitVarInsn(ALOAD, 2);

                assert debug("ALOAD 3");
                mv.visitVarInsn(ALOAD, 3);

                addSubstatement((ExecutableStatement) subCompileExpression(aPvp.getValue().toCharArray()));

                assert debug("INVOKEINTERFACE Accessor.setValue");
                mv.visitMethodInsn(INVOKEINTERFACE, NAMESPACE + "compiler/ExecutableStatement",
                        "setValue",
                        "(Ljava/lang/Object;Ljava/lang/Object;L"
                                + NAMESPACE + "integration/VariableResolverFactory;Ljava/lang/Object;)Ljava/lang/Object;");

                assert debug("POP");
                mv.visitInsn(POP);
            }
        }

        return ctx;

    } 
                            #location 15 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                private Object getWithProperty(Object ctx) {
        assert debug("\n  ** ENTER -> {with}");

        if (first) {
            assert debug("ALOAD 1");
            mv.visitVarInsn(ALOAD, 1);
            first = false;
        }

        String root = new String(expr, 0, cursor - 1).trim();

        int start = cursor + 1;
    //    int[] res = balancedCaptureWithLineAccounting(expr, cursor, '{', pCtx);
        cursor = balancedCaptureWithLineAccounting(expr, cursor, '{', pCtx);
    //    (pCtx = getParserContext()).incrementLineCount(res[1]);

        this.returnType = ctx != null ? ctx.getClass() : null;

        for (WithStatementPair aPvp : parseWithExpressions(root, subset(expr, start, cursor++ - start))) {
            assert debug("DUP");
            mv.visitInsn(DUP);
            if (aPvp.getParm() == null) {
                // Execute this interpretively now.
                MVEL.eval(aPvp.getValue(), ctx, variableFactory);

                addSubstatement((ExecutableStatement) subCompileExpression(aPvp.getValue().toCharArray()));
            }
            else {
                // Execute interpretively.
                MVEL.setProperty(ctx, aPvp.getParm(), MVEL.eval(aPvp.getValue(), ctx, variableFactory));
                compiledInputs.add(((ExecutableStatement) MVEL.compileSetExpression(aPvp.getParm(),
                        getReturnType(ingressType, aPvp.getParm(), pCtx), pCtx)));

                assert debug("ALOAD 0");
                mv.visitVarInsn(ALOAD, 0);

                assert debug("GETFIELD p" + (compiledInputs.size() - 1));
                mv.visitFieldInsn(GETFIELD, className, "p" + (compiledInputs.size() - 1), "L" + NAMESPACE + "compiler/ExecutableStatement;");

                assert debug("ALOAD 1");
                mv.visitVarInsn(ALOAD, 1);

                assert debug("ALOAD 2");
                mv.visitVarInsn(ALOAD, 2);

                assert debug("ALOAD 3");
                mv.visitVarInsn(ALOAD, 3);

                addSubstatement((ExecutableStatement) subCompileExpression(aPvp.getValue().toCharArray()));

                assert debug("INVOKEINTERFACE Accessor.setValue");
                mv.visitMethodInsn(INVOKEINTERFACE, NAMESPACE + "compiler/ExecutableStatement",
                        "setValue",
                        "(Ljava/lang/Object;Ljava/lang/Object;L"
                                + NAMESPACE + "integration/VariableResolverFactory;Ljava/lang/Object;)Ljava/lang/Object;");

                assert debug("POP");
                mv.visitInsn(POP);
            }
        }

        return ctx;

    }