关于javax.servlet-api 和 servlet-api 区别

柔光的暖阳◎ 2022-03-17 04:06 386阅读 0赞

## 现象： ##

使用SpringRunner进行test的时候，抛出如下异常信息

java.lang.NoClassDefFoundError: javax/servlet/SessionCookieConfig
    
    	at org.springframework.test.context.web.AbstractGenericWebContextLoader.configureWebResources(AbstractGenericWebContextLoader.java:201)
    	at org.springframework.test.context.web.AbstractGenericWebContextLoader.loadContext(AbstractGenericWebContextLoader.java:128)
    	at org.springframework.test.context.web.AbstractGenericWebContextLoader.loadContext(AbstractGenericWebContextLoader.java:61)
    	at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:108)
    	at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:251)
    	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:98)
    	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:116)
    	at org.springframework.test.context.support.DefaultTestContext.getApplicationContext(DefaultTestContext.java:83)
    	at org.springframework.test.context.web.ServletTestExecutionListener.setUpRequestContextIfNecessary(ServletTestExecutionListener.java:189)
    	at org.springframework.test.context.web.ServletTestExecutionListener.prepareTestInstance(ServletTestExecutionListener.java:131)
    	at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:230)
    	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:228)
    	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:287)
    	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:289)
    	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:247)
    	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
    	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    	at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    	at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    	at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
    Caused by: java.lang.ClassNotFoundException: javax.servlet.SessionCookieConfig
    	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
    	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    	... 31 more

在 debug 模式下，看到 standaloneSetup(clrr) 得到的是 StandaloneMockMvcBuilder 对象和 异常堆栈中类名一致。

在 Cannot create MockHttpSession with servlet 2.x, 得到异常详情信息：Spring 4.0 需要得到 servlet 3.0 或以上版本的支持。

> Since Spring Framework 4.0, the set of mocks in the [org.springframework.mock.web][] package is based on the Servlet 3.0 API.  
> @link [spring文档地址][spring]

但是项目中引用的Servlet-api是2.5版本的，如下

<dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>servlet-api</artifactId>
         <version>2.5</version>
         <scope>provided</scope>
     </dependency>

替换成3.0以上版本即可成功运行

<dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>javax.servlet-api</artifactId>
          <version>3.1.0</version>
    </dependency>

细心的同学会发现两者的坐标是不一样的，一个是javax.servlet-api，另外一个是servlet-api。  
两者的区别是：

> servlet.jar 是servlet 3.0 版本之前的地址  
> javax.servlet-api.jar 是servlet 3.0 版本之后的地址

参考：[https://www.cnblogs.com/TonyYPZhang/p/5185386.html][https_www.cnblogs.com_TonyYPZhang_p_5185386.html]

[org.springframework.mock.web]: http://org.springframework.mock.web
[spring]: https://docs.spring.io/spring/docs/4.3.15.RELEASE/spring-framework-reference/htmlsingle/#mock-objects
[https_www.cnblogs.com_TonyYPZhang_p_5185386.html]: https://www.cnblogs.com/TonyYPZhang/p/5185386.html