#vulnerable code 
                                @Test
    public void testTokenPattern() {
        TokenPattern pattern = TokenPattern.builder()
                .compile("(method|hidden|local) [static] <return-type> <name> `(<*parameters>`) `{ <*body> `}[;]")
                .build();

        LexicalPatternElement content = pattern.getPatternContent();
        Assertions.assertNotNull(content);

        TokenExtractorResult result = pattern.extract(SOURCE);
        Assertions.assertNotNull(result);

        if (result.hasErrorMessage()) {
            System.out.println("Error message: " + result.getErrorMessage());
        }

        Assertions.assertTrue(result.isMatched());
        Assertions.assertNotNull(result.getWildcards());
        Assertions.assertEquals(4, result.getWildcards().size());

        Assertions.assertEquals("void", result.getWildcards().get("return-type").asString());
        Assertions.assertEquals("test", result.getWildcards().get("name").asString());
        Assertions.assertEquals("15,()25", result.getWildcards().get("*parameters").asString());
        Assertions.assertEquals("Console.print(test)", result.getWildcards().get("*body").asString());
    } 
                            #location 19 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Test
    public void testTokenPattern() {
        TokenPattern pattern = TokenPattern.builder()
                .compile("class <name> [extends <inherited>] `{ <*body> `}")
                .build();

        LexicalPatternElement content = pattern.getPatternContent();
        Assertions.assertNotNull(content);

        TokenExtractorResult result = pattern.extract(SOURCE);
        Assertions.assertNotNull(result);

        if (result.hasErrorMessage()) {
            System.out.println("Error message: " + result.getErrorMessage());
        }

        Assertions.assertTrue(result.isMatched());
        Assertions.assertNotNull(result.getWildcards());

        System.out.println(result.getWildcards());

        Assertions.assertEquals(2, result.getWildcards().size());
        Assertions.assertEquals("Foo", result.getWildcards().get("name").asString());
        Assertions.assertEquals("methodanotherEcho(Stringmessage){Console.print(message);}", result.getWildcards().get("*body").asString());
    }