Spring类AbstractMessageConverterMethodProcessor

时间：2016-07-22 18:57:48

标签： java spring spring-mvc nullpointerexception

我正在创建一个我正在验证字段的服务。如果我的规则字段不正确，我抛出一个ResourceBusinessException，这是我为处理Unprocessable实体而创建的类。但是，抛出此异常时，Spring会在AbstractMessageConverterMethodProcessor类上抛出NullPointerException。

为了使我对我所谈论的内容更具可读性，下面我将附上与此问题相关的所有代码。为了使它更简单，我在代码上强制例外。

首先，我的春季版本：

<spring-framework-version>4.2.6.RELEASE</spring-framework-version>

我的控制器方法：

 /**
 * @param MyType
 * @return
 */
@ApiOperation(value = "", notes = "", authorizations = { @Authorization(value = ApplicationSwaggerConfig.securityOAuth2, scopes = { @AuthorizationScope(scope = WRITE_SCOPE, description = WRITE_DESCRIPTION) }) })
@ApiResponses(value = { @ApiResponse(code = 200, message = "OK"), @ApiResponse(code = 201, message = "Created"), @ApiResponse(code = 401, message = "Unauthorized"),
@ApiResponse(code = 403, message = "Forbidden"), @ApiResponse(code = 404, message = "Not Found"), @ApiResponse(code = 422, message = "Unprocessable Entity") })
@RequestMapping(value = "/xpto", method = POST, produces = { APPLICATION_XML_VALUE, APPLICATION_JSON_VALUE })
public ResponseEntity<Void> saveXPTO(@RequestBody MyType myType) {
    Long tenantId = 1L;
    MyClass myObject = service.findMyClass(tenantId, empresaType.getAttribute());
    MyOtherClass myOtherObject= this.applyForOne(myObject);
    PreconditionsRest.checkCondition(false, "ERROR!!"); // This is where I'm forcing an error.
    contribuinteService.saveMyOtherObject(myOtherObject);
    return new ResponseEntity<Void>(new HttpHeaders(), CREATED);
}

我的服务方式：

/**
 * Check condition.
 *
 * @param condition O(a)(s) condition
 */
public static void checkCondition(boolean condition, String message){
    if (!condition) {
        throw new ResourceBusinessException(message);
    }
}

我的ResourceBusinessException类：

public class ResourceBusinessException extends RuntimeException{

private static final long serialVersionUID = 1L;


private ErrorMessage errorMessage;


public ResourceBusinessException() {
    super();
}


public ResourceBusinessException(String message, Throwable cause,boolean enableSuppression, boolean writableStackTrace) {
    super(message, cause, enableSuppression, writableStackTrace);
}


public ResourceBusinessException(String message, Throwable cause) {
    super(message, cause);
}


public ResourceBusinessException(String message) {
    super(message);
}


public ResourceBusinessException(Throwable cause) {
    super(cause);
}


public ResourceBusinessException(ErrorMessage errorMessage){
    super(errorMessage.getDetail());
    this.errorMessage = errorMessage;
}


public ErrorMessage getErrorMessage() {
    return errorMessage;
}

}

我的ResourceBusinessExceptionHandler类：

public class ResourceBusinessExceptionHandler extends ErrorMessageRestExceptionHandler<ResourceBusinessException>{


private static final Logger LOGGER = LoggerFactory.getLogger(ResourceBusinessExceptionHandler.class);

private ErrorMessage errorMessage;

public ResourceBusinessExceptionHandler() {
    super(UNPROCESSABLE_ENTITY);
}


@Override
public ErrorMessage createBody(ResourceBusinessException ex, HttpServletRequest req) {
    LOGGER.debug("ResourceBusinessExceptionHandler - Started");
    ErrorMessage tmpl = super.createBody(ex, req);
    ValidationErrorMessage msg = new ValidationErrorMessage(tmpl);
    errorMessage=ex.getErrorMessage();
    if(errorMessage==null){
        errorMessage = new ErrorMessage();
    }
    msg.setType(ResourceHandlerUtil.getType(errorMessage,UNPROCESSABLE_ENTITY_SPEC));
    msg.setTitle(ResourceHandlerUtil.getTitle(errorMessage,HttpStatus.UNPROCESSABLE_ENTITY));
    msg.setDetail(ResourceHandlerUtil.getDetail(errorMessage,HttpStatus.UNPROCESSABLE_ENTITY));
    msg.setInstance(ResourceHandlerUtil.getUriInstance(errorMessage,UNPROCESSABLE_ENTITY_URI));
    LOGGER.debug("ResourceBusinessExceptionHandler - Complete");
    return msg;
}

我的配置bean：

<bean id="compositeExceptionResolver" class="org.springframework.web.servlet.handler.HandlerExceptionResolverComposite">
    <property name="order" value="0" />
    <property name="exceptionResolvers">
        <list>
            <ref bean="exceptionHandlerExceptionResolver" />
            <ref bean="restExceptionResolver" />
        </list>
    </property>
</bean>

    <bean id="restExceptionResolver" class="cz.jirutka.spring.exhandler.RestHandlerExceptionResolverFactoryBean">
    <property name="messageSource" ref="httpErrorMessageSource" />
    <property name="defaultContentType" value="application/json" />
    <property name="exceptionHandlers">
        <map>
            <!-- 422 -->
            <entry key="com.company.project.exception.ResourceBusinessException">
                <bean class="com.company.project.exception.handler.ResourceBusinessExceptionHandler"/>
            </entry>
        </map>
    </property>
</bean><bean id="exceptionHandlerExceptionResolver" class="org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver"/>

<bean id="httpErrorMessageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource" p:defaultEncoding="UTF-8"/>

然后，当我向我的服务发出请求时，我的控制台上会出现以下堆栈跟踪：

  

15：26：09.119 [http-nio-8013-exec-3] DEBUG c.j.s.e.h.RestExceptionHandler - POST / api / xpto~＆gt; 422   com.company.project.exception.ResourceBusinessException：ERROR !!

[...]然后，NullPointerException ...

  

错误c.j.s.e.RestHandlerExceptionResolver - 无法处理错误响应：＆lt; 422 Unprocessable Entity，ValidationErrorMessage（errors = []），{}＆gt;   java.lang.NullPointerException：null       在org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.getGenericType（AbstractMessageConverterMethodProcessor.java:271）〜[spring-webmvc-4.2.6.RELEASE.jar：4.2.6.RELEASE]       在org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters（AbstractMessageConverterMethodProcessor.java:172）〜[spring-webmvc-4.2.6.RELEASE.jar：4.2.6.RELEASE]       在org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue（HttpEntityMethodProcessor.java:183）〜[spring-webmvc-4.2.6.RELEASE.jar：4.2.6.RELEASE]       at cz.jirutka.spring.exhandler.RestHandlerExceptionResolver.processResponse（RestHandlerExceptionResolver.java:141）〜[spring-rest-exception-handler-1.0.3.jar：1.0.3]       at cz.jirutka.spring.exhandler.RestHandlerExceptionResolver.doResolveException（RestHandlerExceptionResolver.java:107）〜[spring-rest-exception-handler-1.0.3.jar：1.0.3]       at org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException（AbstractHandlerExceptionResolver.java:137）[spring-webmvc-4.2.6.RELEASE.jar：4.2.6.RELEASE]       在org.springframework.web.servlet.DispatcherServlet.processHandlerException（DispatcherServlet.java:1185）[spring-webmvc-4.2.6.RELEASE.jar：4.2.6.RELEASE]       在org.springframework.web.servlet.DispatcherServlet.processDispatchResult（DispatcherServlet.java:1022）[spring-webmvc-4.2.6.RELEASE.jar：4.2.6.RELEASE]       在org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:973）[spring-webmvc-4.2.6.RELEASE.jar：4.2.6.RELEASE]       在org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:895）[spring-webmvc-4.2.6.RELEASE.jar：4.2.6.RELEASE]       在org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:967）[spring-webmvc-4.2.6.RELEASE.jar：4.2.6.RELEASE]       在org.springframework.web.servlet.FrameworkServlet.doPost（FrameworkServlet.java:869）[spring-webmvc-4.2.6.RELEASE.jar：4.2.6.RELEASE]       在javax.servlet.http.HttpServlet.service（HttpServlet.java:648）[servlet-api.jar：na]       在org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:843）[spring-webmvc-4.2.6.RELEASE.jar：4.2.6.RELEASE]       在javax.servlet.http.HttpServlet.service（HttpServlet.java:729）[servlet-api.jar：na]       at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:292)[catalina.jar:8.0.36]       在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:207）[catalina.jar：8.0.36]       at org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）[tomcat-websocket.jar：8.0.36]       在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:240）[catalina.jar：8.0.36]       在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:207）[catalina.jar：8.0.36]       在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:212）[catalina.jar：8.0.36]       at org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:106)[catalina.jar:8.0.36]       at org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:502)[catalina.jar:8.0.36]       在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:141）[catalina.jar：8.0.36]       在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:79）[catalina.jar：8.0.36]       at org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:616)[catalina.jar:8.0.36]       at org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:88）[catalina.jar：8.0.36]       在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:528）[catalina.jar：8.0.36]       在org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1099）[tomcat-coyote.jar：8.0.36]       at org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:670)[tomcat-coyote.jar:8.0.36]       在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1520）[tomcat-coyote.jar：8.0.36]       在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.run（NioEndpoint.java:1476）[tomcat-coyote.jar：8.0.36]       at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142）[na：1.8.0_65]       at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:617)[na:1.8.0_65]       at org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）[tomcat-util.jar：8.0.36]       在java.lang.Thread.run（Thread.java:745）[na：1.8.0_65]

更新

下面是类RestHanlderExceptionResolver的方法processResponse：

  protected void processResponse(ResponseEntity<?> entity, NativeWebRequest webRequest) throws Exception {

    ModelAndViewContainer mavContainer = new ModelAndViewContainer();
    try {
        responseProcessor.handleReturnValue(entity, null, mavContainer, webRequest);

    } catch (HttpMediaTypeNotAcceptableException ex) {
        LOG.debug("Requested media type is not supported, falling back to default one");
        fallbackResponseProcessor.handleReturnValue(entity, null, mavContainer, webRequest);
    }
}

1 个答案:

答案 0 :(得分：0)

我发现了问题。我使用Spring的版本与spring-rest-exception-handler-version不兼容。我正在使用的其余异常处理程序来自此github项目：https://github.com/jirutka/spring-rest-exception-handler。

因此，如果您使用的是spring 4.2.6 RELEASE版本，则应将spring-rest-exception-handler的版本更新为1.2.0。这应该解决NullPointerException。

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