修復java.lang.UnsupportedClassVersionError的問題：不支持的major.minor版本52

我已閱讀所有關於此的帖子，我可以找到，但我似乎無法通過這個錯誤來獲得我的maven spring mvc web申請工作。當我訪問本地主機或我的控制器中指定的任何URI時，我只獲得HTTP狀態500。修復java.lang.UnsupportedClassVersionError的問題：不支持的major.minor版本52

根據我的理解，問題的發生是因爲在編譯時使用的JDK比在運行時使用的更高。但在我看來，所有對JDK或JRE的引用在我看來都是一樣的。（1.8）根據這樣看來，我需要用java 1.8是這個堆棧溢出後，所以我不知道是什麼問題：

How to fix java.lang.UnsupportedClassVersionError: Unsupported major.minor version

步驟我已經採取

我確信我的pom.xml文件引用了java 1.8。在intellij中：在編譯器設置下，我設置目標字節碼版本爲1.8。在Maven設置下，導入器的JDK與運行器一樣設置爲java 1.8。在項目結構中，項目SDK設置爲java 1.8，項目語言級別設置爲8.我還檢查了java.com並確認在Internet Explorer中運行的Java版本與我的JDK和JRE版本相同。我也確保我的電腦上的PATH變量指向正確的JDK。作爲一個黑暗中的鏡頭，我也嘗試更改所有使用java 1.7的引用，但部署後仍然出現相同的錯誤。

下面我列出了我的pom.xml文件和錯誤的堆棧跟蹤。一如既往，感謝您的時間和協助！

的pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> 
    <modelVersion>4.0.0</modelVersion> 
    <groupId>com.projectName.project</groupId> 
    <artifactId>Project</artifactId> 
    <packaging>war</packaging> 
    <version>1.0-SNAPSHOT</version> 
    <name>Test Maven Webapp</name> 
    <url>http://maven.apache.org</url> 

    <properties> 
     <org.springframework.version>4.0.6.RELEASE</org.springframework.version> 
     <hibernate.version>5.2.1.Final</hibernate.version> 
     <mysql.connector.version>5.5.49</mysql.connector.version> 
     <hibernate.version>5.2.1.Final</hibernate.version> 
     <mysql.connector.version>5.5.50</mysql.connector.version> 

    </properties> 

    <dependencies> 
     <!-- JDBC Driver --> 
     <dependency> 
      <groupId>mysql</groupId> 
      <artifactId>mysql-connector-java</artifactId> 
      <version>6.0.3</version> 
     </dependency> 

     <dependency> 
      <groupId>junit</groupId> 
      <artifactId>junit</artifactId> 
      <version>3.8.1</version> 
      <scope>test</scope> 
     </dependency> 

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

     <!-- Spring --> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-context</artifactId> 
      <version>${org.springframework.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-webmvc</artifactId> 
      <version>${org.springframework.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-tx</artifactId> 
      <version>${org.springframework.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework</groupId> 
      <artifactId>spring-orm</artifactId> 
      <version>${org.springframework.version}</version> 
     </dependency> 
     <dependency> 
      <groupId>org.springframework.data</groupId> 
      <artifactId>spring-data-jpa</artifactId> 
      <version>1.10.2.RELEASE</version> 
     </dependency> 

     <!-- Hibernate --> 
     <dependency> 
      <groupId>org.hibernate</groupId> 
      <artifactId>hibernate-core</artifactId> 
      <version>5.1.1.Final</version> 
     </dependency> 
     <dependency> 
      <groupId>org.hibernate.javax.persistence</groupId> 
      <artifactId>hibernate-jpa-2.0-api</artifactId> 
      <version>1.0.1.Final</version> 
     </dependency> 
     <dependency> 
      <groupId>org.hibernate</groupId> 
      <artifactId>hibernate-entitymanager</artifactId> 
      <version>5.1.1.Final</version> 
     </dependency> 

     <!-- HSQL Database --> 
     <dependency> 
      <groupId>org.hsqldb</groupId> 
      <artifactId>hsqldb</artifactId> 
      <version>2.3.2</version> 
     </dependency> 

     <!-- JSON --> 
     <dependency> 
      <groupId>org.json</groupId> 
      <artifactId>json</artifactId> 
      <version>20160810</version> 
     </dependency> 

     <!-- Jackson To Convert java to JSON --> 
     <dependency> 
      <groupId>com.fasterxml.jackson.core</groupId> 
      <artifactId>jackson-databind</artifactId> 
      <version>2.8.1</version> 
     </dependency> 

     <!-- Application View --> 
     <dependency> 
      <groupId>jstl</groupId> 
      <artifactId>jstl</artifactId> 
      <version>1.2</version> 
     </dependency> 


     <dependency> 
      <groupId>org.apache.commons</groupId> 
      <artifactId>commons-dbcp2</artifactId> 
      <version>2.0</version> 
     </dependency> 

     <!-- Log4J --> 
     <dependency> 
      <groupId>log4j</groupId> 
      <artifactId>log4j</artifactId> 
      <version>1.2.17</version> 
     </dependency> 
    </dependencies> 

    <build> 
     <finalName>ROOT</finalName> 
     <plugins> 
      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-compiler-plugin</artifactId> 

       <version>2.5.1</version> 
       <configuration> 
        <source>1.8</source> 
        <target>1.8</target> 
       </configuration> 
      </plugin> 

      <plugin> 
       <groupId>org.apache.maven.plugins</groupId> 
       <artifactId>maven-war-plugin</artifactId> 
       <configuration> 
        <webXml>src\main\webapp\WEB-INF\web.xml</webXml> 
       </configuration> 
      </plugin> 
     </plugins> 
    </build> 
</project>

堆棧跟蹤

type Exception report 

message Servlet.init() for servlet springDispatcherServlet threw exception 

description The server encountered an internal error that prevented it from fulfilling this request. 

exception 
javax.servlet.ServletException: Servlet.init() for servlet springDispatcherServlet threw exception 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522) 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095) 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672) 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502) 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458) 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
java.lang.Thread.run(Thread.java:724) 


root cause 

java.lang.UnsupportedClassVersionError: springmvc/controllers/AccountController : Unsupported major.minor version 52.0 (unable to load class springmvc.controllers.AccountController) 
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2506) 
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:831) 
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1274) 
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1139) 
org.springframework.util.ClassUtils.forName(ClassUtils.java:247) 
org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:395) 
org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1346) 
org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1317) 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:594) 
org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1394) 
org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:385) 
org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:362) 
org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:348) 
org.springframework.context.support.AbstractApplicationContext.getBeanNamesForType(AbstractApplicationContext.java:1051) 
org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:119) 
org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:103) 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:126) 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1612) 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1549) 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539) 
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) 
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) 
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) 
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) 
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) 
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:703) 
org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760) 
org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) 
org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:658) 
org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:624) 
org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:672) 
org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:543) 
org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:484) 
org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 
javax.servlet.GenericServlet.init(GenericServlet.java:158) 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616) 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522) 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095) 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672) 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502) 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458) 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
java.lang.Thread.run(Thread.java:724)

來源

2016-09-03 user3792733

此錯誤僅表示：您運行的是JVM版本7或更低版本，並嘗試加載使用Java 8編譯的類。 – Seelenvirtuose

當我在命令行上運行java -version時，它表明我正在運行Java 8. – user3792733

你也可以在「java ...」的命令行上啓動你的tomcat嗎？ – Seelenvirtuose

UnsupportedClassVersionError是總是由於這樣的事實，一類是用Java版本比Java版本編譯越大被用來運行它。

當你有一個IDE，像Tomcat和其他東西的應用服務器，你可能有幾個設置，必須指向一個JDK（與JAVA_HOME環境變量是最重要的）。如果它們都指向正確的地方，沒有任何問題，但有錯誤，如可能：

設置指向JRE，而不是JDK

這會導致問題時，有需要javac這在JRE中不存在。例如Tomcat需要javac來編譯東西，所以JRE是不夠的。

設置指向不同JDK比其它設置

這將導致UnsupportedClassVersionError，然後你需要找到它的設置是錯誤的。通常JAVA_HOME指向正確的位置，但不同的設置指向較舊的JDK。一個常見的問題是JAVA_HOME指向Oracle的JDK和Tomcat指向OpenJDK。

由於您可以使用-source和-target標誌爲較舊的版本進行編譯，因此您不需要在系統上保留多個JDK。刪除舊的和神祕的錯誤的機會減少。

來源

2016-09-03 15:07:16 Kayaman

修復java.lang.UnsupportedClassVersionError的問題：不支持的major.minor版本52

回答

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