Error:unsupported class file version 52.0问题的解决

     这个问题主要的原因是依赖包的编译版本比主程序的编译版本高，导致主程序无法正常编译或运行，解决这个问题无非两招：

     1、提升主程序的编译器版本，用最新的编译器编译主程序，这样就可以兼容那个依赖包

     2、降低依赖包的编译版本。比如maven，降低到1.6的方法是：

 

<plugin>   

  <groupId>org.apache.maven.plugins</groupId>   

  <artifactId>maven-compiler-plugin</artifactId>  

  <version>3.1</version>   

  <configuration>   

      <source>1.6</source>   

      <target>1.6</target>   

      <encoding>UTF8</encoding>   

  </configuration>   

</plugin>   

另附打本地依赖包的配置：

 

<build>  

        <sourceDirectory>src/main/java</sourceDirectory>  

        <plugins>  

            <plugin>  

                <groupId>org.apache.maven.plugins</groupId>  

                <artifactId>maven-compiler-plugin</artifactId>  

                <configuration>  

                    <defaultLibBundleDir>lib</defaultLibBundleDir>  

                    <source>1.5</source>  

                    <target>1.5</target>  

                    <encoding>UTF-8</encoding>  

                </configuration>  

            </plugin>  

            <plugin>  

                <groupId>org.apache.maven.plugins</groupId>  

                <artifactId>maven-jar-plugin</artifactId>  

                <configuration>  

                    <archive>  

                        <manifest>  

                            <addClasspath>true</addClasspath>  

                            <classpathPrefix></classpathPrefix>  

                            <mainClass>com.xx.xx.xx</mainClass>  

                        </manifest>  

                    </archive>  

                </configuration>  

            </plugin>  

            <plugin>  

                <groupId>org.apache.maven.plugins</groupId>  

                <artifactId>maven-dependency-plugin</artifactId>  

                <executions>  

                    <execution>  

                        <id>copy</id>  

                        <phase>install</phase>  

                        <goals>  

                            <goal>copy-dependencies</goal>  

                        </goals>  

                        <configuration>  

                            <outputDirectory>  

                                ${project.build.directory}  

                            </outputDirectory>  

                        </configuration>  

                    </execution>  

                </executions>  

            </plugin>  

            <plugin>  

                <groupId>org.apache.maven.plugins</groupId>  

                <artifactId>maven-resources-plugin</artifactId>  

                <version>2.2</version>  

                <configuration>  

                    <encoding>UTF-8</encoding>  

                </configuration>  

            </plugin>  

        </plugins>  

    </build>  

 

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