【持续更新】Springboot 学习之异常解决办法总结

1. org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field ‘timestamp’ cannot be found on object of type ‘org.springframework.ui.ModelMap’ - maybe not public?

org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'timestamp' cannot be found on object of type 'org.springframework.ui.ModelMap' - maybe not public?
	at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:213) ~[spring-expression-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:100) ~[spring-expression-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:87) ~[spring-expression-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:111) ~[spring-expression-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:270) ~[spring-expression-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration$ExpressionResolver.resolvePlaceholder(ErrorMvcAutoConfiguration.java:316) ~[spring-boot-autoconfigure-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.boot.autoconfigure.web.servlet.error.NonRecursivePropertyPlaceholderHelper$NonRecursivePlaceholderResolver.resolvePlaceholder(NonRecursivePropertyPlaceholderHelper.java:56) ~[spring-boot-autoconfigure-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:145) ~[spring-core-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.boot.autoconfigure.web.servlet.error.NonRecursivePropertyPlaceholderHelper.parseStringValue(NonRecursivePropertyPlaceholderHelper.java:38) ~[spring-boot-autoconfigure-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[spring-core-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration$SpelView.render(ErrorMvcAutoConfiguration.java:243) ~[spring-boot-autoconfigure-2.0.0.RELEASE.jar:2.0.0.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1325) ~[spring-webmvc-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1069) ~[spring-webmvc-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1008) ~[spring-webmvc-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978) ~[spring-webmvc-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870) ~[spring-webmvc-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855) ~[spring-webmvc-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) ~[spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) ~[spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.4.RELEASE.jar:5.0.4.RELEASE]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) ~[tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_171]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_171]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.28.jar:8.5.28]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_171]

产生原因

下面代码是捕获全局异常类，并返回指定错误页面 error。由于 Springboot 已经有了这个 error 的ModelAndView ,可以试试访问你的springboot项目的 localhost:8080/error 可以看到 error 页面，也就是说我们定义的 error 与 springboot 默认的冲突了，所以不好使。

// 在 类 org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration
//中解析视图时报错
String result = this.helper.replacePlaceholders(this.template, resolver);

@ControllerAdvice(basePackages = "com.controller")
public class GlobalExceptionHandler {
	private static final Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler.class);
	@ExceptionHandler(Exception.class)
	public ModelAndView errorResult(Exception e) {
		Map<String, Object> errorResultMap = new HashMap<String, Object>(8);
		errorResultMap.put("errorCode", "500");
		errorResultMap.put("errorMessage", "系统错误");
		
		ModelAndView modelAndView = new ModelAndView();
		modelAndView.setViewName("error");
		modelAndView.addObject("errors", errorResultMap);
		logger.error(e.getLocalizedMessage());
		return modelAndView;
	}
}

解决办法

目前我能想到的解办法就是将返回的指定页面 error 改名，例如改为 errors。

2. Consider defining a bean of type ‘org.hibernate.SessionFactory’ in your configuration.

产生原因

在整合 Hibernate 时，在Dao 中加入了如下代码：

@Autowired
private SessionFactory sessionFactory;

解决办法

方法一： 将上述代码替换为下面的代码，

@Autowired
private EntityManager entityManager;

private Session getSession() {
    return entityManager.unwrap(Session.class);
}

然后在配置文件中添加spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext ，在原来使用 sessionFactory 的地方改为通过方法 getSession() 获取。

方法二：
在配置文件中添加spring.jpa.hibernate.naming.physical-strategy = org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl 配置；
然后将@Autowired private SessionFactory sessionFactory; 改为下面的方法获取

@Autowired
private EntityManagerFactory entityManagerFactory;

public SessionFactory getSessionFactory() {
	return entityManagerFactory.unwrap(SessionFactory.class);
}

以上解决方案是基于 Springboot 2.0 ，如果想知道 Springboot 1.5 整合 Hibernate 时报这错误的请参考文章 https://www.devglan.com/spring-boot/spring-boot-hibernate-5-example#/hibernateconfig

3. 关于 Springboot 单元测试 @RunWith(SpringRunner.class) 中的 SpringRunner.class 类找不到异常 或 @RunWith(SpringJUnit4ClassRunner.class) 中 SpringJUnit4ClassRunner.class 类找不到异常

产生原因：

因为在 Springboot 2.0 中 的 spring-boot-starter-test 中 spring-test用的是 5.0.4 版本，该版本中没有上述的类，所以找不到上述的类。

解决办法

修改 pom 配置为如下

<dependency>
    <groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-test</artifactId>
	<scope>test</scope>
	<exclusions>
		<exclusion>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
		</exclusion>
	</exclusions>
</dependency>

<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-test</artifactId>
	<version>5.0.5.RELEASE</version>
	<scope>test</scope>
</dependency>

4. No task executor bean found for async processing: no bean of type TaskExecutor and no bean named ‘taskExecutor’ either

产生原因：

因为 Spring 容器中没有 TaskExecutor Bean ，所以找不到上述的 Bean。

解决办法

向 Spring 容器中注入该 Bean

package com.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.task.TaskExecutor;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

/**
* @Description 
*   注入 TaskExecutor 解决 No task executor bean found for async processing: 
* 	no bean of type TaskExecutor and no bean named ‘taskExecutor’ either
* @author 欧阳
* @since 2019年4月14日 下午12:28:11
* @version V1.0
*/

@Configuration
public class TaskExecutorBean {
	
	@Bean
	public TaskExecutor getTaskExecutor() {
		
		return new ThreadPoolTaskExecutor();
	}
}

5 . 启动时有如下报错

Caused by: java.nio.charset.MalformedInputException: Input length = 2
	at java.nio.charset.CoderResult.throwException(CoderResult.java:281)
	at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:339)
	at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
	at java.io.InputStreamReader.read(InputStreamReader.java:184)
	at org.yaml.snakeyaml.reader.UnicodeReader.read(UnicodeReader.java:125)
	at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:223)
	... 55 common frames omitted

产生原因：

yml 配置文件 编码格式有误

解决：

首先设置 idea 编码为项目所使用的编码，我这用的是 UTF-8 ，然后删除有编码问题的配置文件并重新新增。

6. org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only

原因：

同一个处理逻辑中包含有多个使用 @Transactional 默认事务 PROPAGATION_REQUIRED 时 其中一个 注有 @Transactional 报错后事务不正常提交而回滚导致的（如果存在事务则使用当前事务，否则新建一个事务）

解决：将默认事务改为 PROPAGATION_REQUIRES_NEW 或 PROPAGATION_NESTED 让其新建一个事务或新建一个子事务。

7. springboot 启动报错：java.lang.ClassNotFoundException: org.springframework.core.NativeDetector

原因：spring-core 版本问题，没有类 NativeDetector

解决：将 Springboot 升级为 2.4.12 版本