output: #fixed code
                                  public void setSqlSource(MappedStatement ms) {
          MapperTemplate mapperTemplate = getMapperTemplate(ms.getId());
          try {
              if (mapperTemplate != null) {
                  mapperTemplate.setSqlSource(ms);
              }
          } catch (Exception e) {
              throw new RuntimeException("调用方法异常:" + e.getMessage());
          }
      }
input: #vulnerable code 
                                  public void setSqlSource(MappedStatement ms) {
          MapperTemplate mapperTemplate = getMapperTemplate(ms.getId());
          try {
              mapperTemplate.setSqlSource(ms);
          } catch (Exception e) {
              throw new RuntimeException("调用方法异常:" + e.getMessage());
          }
      } 
                              #location 4 
                              #vulnerability type NULL_DEREFERENCE