#vulnerable code 
                                public static BasicAttributeInfo newAttributeInfo(ConstantPool constantPool, short attributeNameIndex) {
        BasicAttributeInfo basicAttributeInfo = null;
        String attributeName = null;
        ConstantPoolInfo constantPoolInfo = constantPool.getCpInfo()[attributeNameIndex - 1];
        if (constantPoolInfo instanceof ConstantUtf8Info) {
            attributeName = ((ConstantUtf8Info) constantPoolInfo).getValue();
        }
        if (attributeName.equals("Code")) {
            basicAttributeInfo = new Code(constantPool, attributeNameIndex);
        } else if (attributeName.equals("ConstantValue")) {
            basicAttributeInfo = new ConstantValue(constantPool, attributeNameIndex);
        } else if (attributeName.equals("Deprecated")) {
            basicAttributeInfo = new Deprecated(constantPool, attributeNameIndex);
        } else if (attributeName.equals("Exceptions")) {
            basicAttributeInfo = new Exceptions(constantPool, attributeNameIndex);
        } else if (attributeName.equals("LineNumberTable")) {
            basicAttributeInfo = new LineNumberTable(constantPool, attributeNameIndex);
        } else if (attributeName.equals("LocalVariableTable")) {
            basicAttributeInfo = new LocalVariableTable(constantPool, attributeNameIndex);
        } else if (attributeName.equals("SourceFile")) {
            basicAttributeInfo = new SourceFile(constantPool, attributeNameIndex);
        } else if (attributeName.equals("Synthetic")) {
            basicAttributeInfo = new Synthetic(constantPool, attributeNameIndex);
        }
        basicAttributeInfo.setAttributeNameIndex(attributeNameIndex);
        return basicAttributeInfo;
    } 
                            #location 25 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                public static BasicAttributeInfo newAttributeInfo(ConstantPool constantPool, short attributeNameIndex) {
        BasicAttributeInfo basicAttributeInfo = null;
        String attributeName = null;
        ConstantPoolInfo constantPoolInfo = constantPool.getCpInfo()[attributeNameIndex - 1];
        if (constantPoolInfo instanceof ConstantUtf8Info) {
            attributeName = ((ConstantUtf8Info) constantPoolInfo).getValue();
        }
        System.out.println("attributeName = " + attributeName);
        if (attributeName.equals("Code")) {
            basicAttributeInfo = new Code(constantPool, attributeNameIndex);
        } else if (attributeName.equals("ConstantValue")) {
            basicAttributeInfo = new ConstantValue(constantPool, attributeNameIndex);
        } else if (attributeName.equals("Deprecated")) {
            basicAttributeInfo = new Deprecated(constantPool, attributeNameIndex);
        } else if (attributeName.equals("Exceptions")) {
            basicAttributeInfo = new Exceptions(constantPool, attributeNameIndex);
        } else if (attributeName.equals("LineNumberTable")) {
            basicAttributeInfo = new LineNumberTable(constantPool, attributeNameIndex);
        } else if (attributeName.equals("LocalVariableTable")) {
            basicAttributeInfo = new LocalVariableTable(constantPool, attributeNameIndex);
        } else if (attributeName.equals("LocalVariableTypeTable")) {
            basicAttributeInfo = new LocalVariableTypeTable(constantPool, attributeNameIndex);
        } else if (attributeName.equals("SourceFile")) {
            basicAttributeInfo = new SourceFile(constantPool, attributeNameIndex);
        } else if (attributeName.equals("Synthetic")) {
            basicAttributeInfo = new Synthetic(constantPool, attributeNameIndex);
        } else if (attributeName.equals("Signature")) {
            basicAttributeInfo = new Signature(constantPool, attributeNameIndex);
        } else if (attributeName.equals("BootstrapMethods")) {
            basicAttributeInfo = new BootstrapMethods(constantPool, attributeNameIndex);
        } else if (attributeName.equals("InnerClasses")) {
            basicAttributeInfo = new InnerClasses(constantPool, attributeNameIndex);
        } else {
            basicAttributeInfo = new Unparsed(constantPool, attributeNameIndex);
        }
        basicAttributeInfo.setAttributeNameIndex(attributeNameIndex);
        return basicAttributeInfo;
    }