#fixed code
                                @Override
    public Type getType() {
        if (wrappedNode instanceof Parameter) {
            Parameter parameter = (Parameter) wrappedNode;
            if (getParentNode(wrappedNode) instanceof LambdaExpr) {
                int pos = getParamPos(parameter);
                Type lambdaType = JavaParserFacade.get(typeSolver).getType(getParentNode(wrappedNode));

                // TODO understand from the context to which method this corresponds
                //MethodDeclaration methodDeclaration = JavaParserFacade.get(typeSolver).getMethodCalled
                //MethodDeclaration methodCalled = JavaParserFacade.get(typeSolver).solve()
                throw new UnsupportedOperationException(wrappedNode.getClass().getCanonicalName());
            } else {
                Type rawType = null;
                if (parameter.getType() instanceof com.github.javaparser.ast.type.PrimitiveType) {
                    rawType = PrimitiveType.byName(((com.github.javaparser.ast.type.PrimitiveType) parameter.getType()).getType().name());
                } else {
                    rawType = JavaParserFacade.get(typeSolver).convertToUsage(parameter.getType(), wrappedNode);
                }
                if (parameter.isVarArgs()) {
                    return new ArrayType(rawType);
                } else {
                    return rawType;
                }
            }
        } else if (wrappedNode instanceof VariableDeclarator) {
            VariableDeclarator variableDeclarator = (VariableDeclarator) wrappedNode;
            if (getParentNode(wrappedNode) instanceof VariableDeclarationExpr) {
                VariableDeclarationExpr variableDeclarationExpr = (VariableDeclarationExpr) getParentNode(variableDeclarator);
                return JavaParserFacade.get(typeSolver).convert(variableDeclarationExpr.getElementType(), JavaParserFactory.getContext(wrappedNode, typeSolver));
            } else if (getParentNode(wrappedNode) instanceof FieldDeclaration) {
                FieldDeclaration fieldDeclaration = (FieldDeclaration) getParentNode(variableDeclarator);
                return JavaParserFacade.get(typeSolver).convert(fieldDeclaration.getElementType(), JavaParserFactory.getContext(wrappedNode, typeSolver));
            } else {
                throw new UnsupportedOperationException(getParentNode(wrappedNode).getClass().getCanonicalName());
            }
        } else {
            throw new UnsupportedOperationException(wrappedNode.getClass().getCanonicalName());
        }
    }
#vulnerable code 
                                @Override
    public Type getType() {
        if (wrappedNode instanceof Parameter) {
            Parameter parameter = (Parameter) wrappedNode;
            if (wrappedNode.getParentNode() instanceof LambdaExpr) {
                int pos = getParamPos(parameter);
                Type lambdaType = JavaParserFacade.get(typeSolver).getType(wrappedNode.getParentNode());

                // TODO understand from the context to which method this corresponds
                //MethodDeclaration methodDeclaration = JavaParserFacade.get(typeSolver).getMethodCalled
                //MethodDeclaration methodCalled = JavaParserFacade.get(typeSolver).solve()
                throw new UnsupportedOperationException(wrappedNode.getClass().getCanonicalName());
            } else {
                Type rawType = null;
                if (parameter.getType() instanceof com.github.javaparser.ast.type.PrimitiveType) {
                    rawType = PrimitiveType.byName(((com.github.javaparser.ast.type.PrimitiveType) parameter.getType()).getType().name());
                } else {
                    rawType = JavaParserFacade.get(typeSolver).convertToUsage(parameter.getType(), wrappedNode);
                }
                if (parameter.isVarArgs()) {
                    return new ArrayType(rawType);
                } else {
                    return rawType;
                }
            }
        } else if (wrappedNode instanceof VariableDeclarator) {
            VariableDeclarator variableDeclarator = (VariableDeclarator) wrappedNode;
            if (wrappedNode.getParentNode() instanceof VariableDeclarationExpr) {
                VariableDeclarationExpr variableDeclarationExpr = (VariableDeclarationExpr) variableDeclarator.getParentNode();
                return JavaParserFacade.get(typeSolver).convert(variableDeclarationExpr.getElementType(), JavaParserFactory.getContext(wrappedNode, typeSolver));
            } else if (wrappedNode.getParentNode() instanceof FieldDeclaration) {
                FieldDeclaration fieldDeclaration = (FieldDeclaration) variableDeclarator.getParentNode();
                return JavaParserFacade.get(typeSolver).convert(fieldDeclaration.getElementType(), JavaParserFactory.getContext(wrappedNode, typeSolver));
            } else {
                throw new UnsupportedOperationException(wrappedNode.getParentNode().getClass().getCanonicalName());
            }
        } else {
            throw new UnsupportedOperationException(wrappedNode.getClass().getCanonicalName());
        }
    } 
                            #location 30 
                            #vulnerability type NULL_DEREFERENCE