SSH中使用延迟加载报错Exception occurred during processing request: could not...

最新推荐文章于 2024-11-27 16:20:46 发布
转载 最新推荐文章于 2024-11-27 16:20:46 发布 · 840 阅读 · 0 ·
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原文链接：https://yq.aliyun.com/articles/686139
文章标签：

#java #运维 #数据库

本文分析了Hibernate懒加载出现could not initialize proxy-noSession错误的原因，并提供了详细的解决方案，包括配置openSessionInViewFilter的具体步骤。

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17:40:17,249 ERROR DefaultDispatcherErrorHandler:42 - Exception occurred during processing request: could not initialize proxy - no Session
org.hibernate.LazyInitializationException: could not initialize proxy - no Session
    at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:148)
    at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:266)
    at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:68)
    at cn.zqr.domain.Customer_$$_jvst34f_0.toString(Customer_$$_jvst34f_0.java)
    at java.lang.String.valueOf(String.java:2994)
    at java.io.PrintStream.println(PrintStream.java:821)
    at org.apache.tomcat.util.log.SystemLogHandler.println(SystemLogHandler.java:272)
    at cn.zqr.action.CustomerAction.load(CustomerAction.java:33)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:870)
    at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:1293)
    at ognl.ObjectMethodAccessor.callMethod(ObjectMethodAccessor.java:68)
    at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethodWithDebugInfo(XWorkMethodAccessor.java:117)
    at com.opensymphony.xwork2.ognl.accessor.XWorkMethodAccessor.callMethod(XWorkMethodAccessor.java:108)
    at ognl.OgnlRuntime.callMethod(OgnlRuntime.java:1369)
    at ognl.ASTMethod.getValueBody(ASTMethod.java:90)
    at ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212)
    at ognl.SimpleNode.getValue(SimpleNode.java:258)
    at ognl.Ognl.getValue(Ognl.java:494)
    at ognl.Ognl.getValue(Ognl.java:458)
    at com.opensymphony.xwork2.ognl.OgnlUtil$2.execute(OgnlUtil.java:309)
    at com.opensymphony.xwork2.ognl.OgnlUtil.compileAndExecute(OgnlUtil.java:340)
    at com.opensymphony.xwork2.ognl.OgnlUtil.getValue(OgnlUtil.java:307)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:423)
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:287)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:250)
    at org.apache.struts2.interceptor.DeprecationInterceptor.intercept(DeprecationInterceptor.java:41)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:256)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:167)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:265)
    at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:76)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:229)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:191)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:73)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.DateTextFieldInterceptor.intercept(DateTextFieldInterceptor.java:125)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:91)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:253)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:139)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:193)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:189)
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:244)
    at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:564)
    at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:81)
    at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)
错误信息

解决方法:

1.关闭延迟加载(不推荐,我们使用延迟加载是为了提供性能)

2.在web.xml中配置Spring的开关session的时间(一定要在StrutsPrepareAndExecuteFilter 之前配置)

 <filter>
        <filter-name>openSessionInViewFilter</filter-name>
        <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>openSessionInViewFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!--配置struts的过滤器-->
    <filter>
        <filter-name>struts</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
配置openSessionInViewFilter

 还有


<filter>
<filter-name>openSessionInViewFilter</filter-name>
<filter-class>org.springframework.orm.hibernate5.support.OpenSessionInViewFilter</filter-class>
</filter>
中的org.springframework.orm.hibernate5.support.OpenSessionInViewFilter这个类的hibernate5的版本一定要和自己使用的一致,否则又会引发另一个异常
Type Exception Report

Message Filter execution threw an exception

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

javax.servlet.ServletException: Filter execution threw an exception

Root Cause

java.lang.NoSuchMethodError: org.hibernate.SessionFactory.openSession()Lorg/hibernate/classic/Session;
    org.springframework.orm.hibernate3.SessionFactoryUtils.doGetSession(SessionFactoryUtils.java:328)
    org.springframework.orm.hibernate3.SessionFactoryUtils.getSession(SessionFactoryUtils.java:208)
    org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.getSession(OpenSessionInViewFilter.java:294)
    org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:208)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

Note The full stack trace of the root cause is available in the server logs.
异常 


 


 


        
        
                
    

                

        




         

    

    
  



    



                



	

		

			

				
					
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<think>我们正在解决用户的问题：Java中因db.properties配置导致的NullPointerException异常。根据引用[1]和[2]，NullPointerException可能由db.properties配置错误引起，导致数据源配置失败，进而引起MyBatis或Servlet的NullPointerException。解决思路：1.检查db.properties文件是否存在，位置是否正确。2.检查db.properties中的键名是否与代码中读取的键名一致。3.检查数据库连接参数（URL、用户名、密码）是否正确，特别是URL的格式和参数。4.确保数据库驱动类名正确，且驱动JAR已添加到项目。5.检查MyBatis配置文件（如mybatis-config.xml）中是否正确引用了db.properties。下面给出详细步骤和代码示例。</think>
针对 `db.properties` 配置导致的 `NullPointerException`，结合引用中的关键报错信息 `openSessionFromDataSource` [^1] 和 `Request processing failed` [^2]，以下是排查和解决方案：

---

### 🔍 问题根本原因（核心）
`NullPointerException` **通常出现在两种场景**：
1. **配置文件未加载**：`db.properties` 路径错误或资源缺失
2. **配置项读取失败**：代码中读取的键名与配置文件的键名不一致

---

### ✅ 解决方案（分步排查）

#### 1️⃣ **检查配置文件位置和名称**
```bash
项目结构示例：
src/
├── main/
│   ├── resources/
│   │   ├── db.properties  # ✅ 必须在此位置（标准Maven项目）
│   │   ├── mybatis-config.xml
```
- **错误示例**：配置文件放在 `src/main/java` 下会导致无法加载[^2]

#### 2️⃣ **检查 db.properties 内容完整性**
```properties
# 必须包含以下关键项（键名必须完全匹配）：
driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/your_db?useSSL=false&serverTimezone=UTC
username=root
password=123456  # ❌ 若此项缺失会导致数据源初始化失败[^1]
```

#### 3️⃣ **验证 MyBatis 配置引用（mybatis-config.xml）**
```xml
<configuration>
  <properties resource="db.properties"/> <!-- resource路径必须正确 -->
  
  <environments default="development">
    <environment id="development">
      <transactionManager type="JDBC"/>
      <dataSource type="POOLED">
        <property name="driver" value="${driver}"/> <!-- 键名必须一致 -->
        <property name="url" value="${url}"/>
        <property name="username" value="${username}"/>
        <property name="password" value="${password}"/> <!-- 缺少会导致NullPointer -->
      </dataSource>
    </environment>
  </environments>
</configuration>
```

#### 4️⃣ **代码加载方式验证（Java示例）**
```java
// 正确加载方式（Spring Boot）
@Configuration
public class DataSourceConfig {
  
  @Bean
  public DataSource dataSource(
      @Value("${driver}") String driver,  // 键名必须对应
      @Value("${url}") String url,
      @Value("${username}") String username,
      @Value("${password}") String password // ❌ 若password键名错误会抛NPE
  ) {
    // 初始化数据源
  }
}
```

#### 5️⃣ **服务器配置检查**
若使用WebLogic等服务器（如引用[^3]场景）：
```bash
# 检查驱动是否部署（关键）
./bsu.sh -view -status=applied -prod_dir=/path/to/wlserver
```
- 确认 `mysql-connector-java.jar` 已放入 `WEB-INF/lib`

---

### ⚠️ 高频错误点
| 错误场景                  | 报错表现                                  | 解决方案                     |
|--------------------------|------------------------------------------|------------------------------|
| 密码键名拼写错误          | `DefaultSqlSessionFactory.openSessionFromDataSource` 报空指针[^1] | 检查`password` vs `pwd`      |
| 时区参数缺失              | 连接超时后抛NPE                          | URL添加 `&serverTimezone=UTC` |
| MyBatis未引入properties  | `NullPointerException` 在数据源初始化阶段 | 添加 `<properties resource="db.properties"/>` |

---

### 📌 验证流程（快速测试）
1. 在单元测试中强制读取配置：
```java
@Test
public void testDbConfig() {
  String password = System.getProperty("password"); // 故意触发NPE
  // 改用此方式：
  String password = new PropertiesLoader("db.properties").getProperty("password");
}
```
2. 若抛出 `java.io.FileNotFoundException` → 确认文件路径错误

---

			
		

	



              




          




        



    





    



      

      

        
      

      





	

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