Spring boot应用程序，基于eclipse，不受支持的专业。次要版本52.0

Question

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/mysql/cj/jdbc/Driver : Unsupported major.minor version 52.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:278)

Windows 64

日食霓虹灯。1.

马文3

java 1.8和java 1.7都已安装

JAVA_HOME点在1.8 jdk PATH=%PATH%；%JAVA_HOME%/bin/

path\to\Java\jdk1.7.0_80\bin\javaw.exe

JRE System Library [JavaSE-1.7]

Maven Dependencies

<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.4.2.RELEASE</version>
  </parent>

  <groupId>com.worldline.cn.workbench</groupId>
  <artifactId>orm-base</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>orm-base</name>
  <description>orm-base</description>

    <properties>
        <java.version>1.7</java.version>
    </properties>

  <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.1</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.5</version><!--$NO-MVN-MAN-VER$-->
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>1.5.2.RELEASE</version>
            <scope>test</scope>
        </dependency>

    </dependencies> 


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

需要什么吗？

我知道这通常是因为：

项目由Java1.8编译，但由Java1.7（或更低版本）执行。

但是我检查了我的日蚀，

Java编译器：

checked *use compliance from execution environment 'Java SE-1.7' on the 'Java Build Path'*

checked *enable project specific settings*

运行配置：

JRE tab:

    Runtime JRE:

        checked: *Project execution environment 'JavaSE-1.7'(jdk1.7.0_80)*

所以你看，我用1.7编译了这个项目，并用1.7运行它。。。

Answer 1

您的编译器指向JDK 1.8，您的运行时是JDK 1.7。。。您可以更改项目的java编译器配置。1.在日食中-

Answer 2

mysql jar的版本是为JDK1编译的。8.

请参阅此链接以获取正确的版本

例如

Connector/J version JRE Supported
5.1                 1.5.x, 1.6.x, 1.7.x*, 1.8.x**