JRE System Library - Unsupported major.minor version 52.0

Question

I did the downgrade of java 8 to java 7 and I am unable to run my project.

My eclipse configurations are:

My pom.xml file:

<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>
    <groupId>br.usp.icmc.jenkins.saucelabs</groupId>
    <artifactId>JenkinsSaucelabs</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>JenkinsSaucelabs</name>
    <description>JenkinsSaucelabs</description>

    <dependencies>
        <dependency>
           <groupId>junit</groupId>
           <artifactId>junit</artifactId>
           <version>4.11</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.json</groupId>
            <artifactId>json</artifactId>
            <version>20141113</version>
        </dependency>
        <dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>2.4</version>
            <!-- Dependente da versão da JDK -->
            <classifier>jdk15</classifier>
        </dependency>
        <!-- Jersey -->
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-server</artifactId>
            <version>1.11</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-servlet</artifactId>
            <version>1.11</version>
        </dependency>

        <!-- Json -->
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-json</artifactId>
            <version>1.11</version>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-client</artifactId>
            <version>1.19</version>
        </dependency>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>jsr311-api</artifactId>
            <version>0.11</version>
        </dependency>

        <dependency>
            <groupId>com.restfb</groupId>
            <artifactId>restfb</artifactId>
            <version>1.11.0</version>
        </dependency>

        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.3.1</version>
        </dependency>

    </dependencies>

    <build>
        <finalName>TesteJSONSauceLabs</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.0</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>


</project>

I have tested the alternatives of posts:

Eclipse JRE System Library [J2SE-1.5]

No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?

Stacktracer:

Exception in thread "main" java.lang.UnsupportedClassVersionError: org/json/JSONObject : 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 br.usp.icmc.teste.ConnectionRestClient.getSaucelabsJobsByID(ConnectionRestClient.java:30)
    at br.usp.icmc.teste.TestePrincipal.main(TestePrincipal.java:8)

Why am I receiving an UnsupportedClassVersionError exception with Unsupported major.minor version 52.0? Where am I wrong?

Answer 1

You are running your application with the incorrect version of java, or some of the dependencies you are using are compiled for java 8.

Check that your JAVA_HOME is pointing to the correct java installation and that Eclipse truely uses Java 7.