Maven Dependencies of an incorrect version

Question

I am trying to run my Maven project using Java JDK 1.7

Whenever I run my project (as a Maven project) (created under Java JDK 1.7) I get an error:

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/google/common/collect/ImmutableSet : 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 org.codehaus.plexus.classworlds.realm.ClassRealm.loadClassFromSelf(ClassRealm.java:425)
    at org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:42)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
    at org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
    at com.google.inject.internal.Errors.<clinit>(Errors.java:105)
    at com.google.inject.internal.InternalInjectorCreator.<init>(InternalInjectorCreator.java:61)
    at com.google.inject.Guice.createInjector(Guice.java:87)
    at com.google.inject.Guice.createInjector(Guice.java:69)
    at com.google.inject.Guice.createInjector(Guice.java:59)
    at org.codehaus.plexus.DefaultPlexusContainer.addPlexusInjector(DefaultPlexusContainer.java:481)
    at org.codehaus.plexus.DefaultPlexusContainer.<init>(DefaultPlexusContainer.java:206)
    at org.apache.maven.cli.MavenCli.container(MavenCli.java:636)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:282)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:193)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:347)

Note that it is not user generated files which are out of date.

POM 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>EndUsersServ</groupId>
  <artifactId>EndUsersService</artifactId>
  <version>0.0.1-SNAPSHOT</version>

    <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>7</maven.compiler.source>
    <maven.compiler.target>7</maven.compiler.target>
  </properties>

  <dependencies>
      <!-- https://mvnrepository.com/artifact/com.sun.xml.ws/jaxws-rt -->
      <dependency>
        <groupId>com.sun.xml.ws</groupId>
        <artifactId>jaxws-rt</artifactId>
        <version>2.2.6</version>
      </dependency>
      <dependency>
        <groupId>com.sun.org.apache.xml.internal</groupId>
        <artifactId>resolver</artifactId>
        <version>20050927</version>
      </dependency>
  </dependencies>

  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.2.3</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>
    
</project>

I believe one or more of the maven plugins are for version 8 of Java but I am not sure which, and even if they the plugins are featured in the pom file. Do I need to completely reinstall my IDE?

Any help appreciated.

Project Facets

Are you sure you still want to use Java 7? The error means that some dependency or some plugin requires Java 8. — J Fabian Meier, Mar 24 '21 at 15:09
Does this answer your question? [Unsupported major.minor version 52.0](https://stackoverflow.com/questions/22489398/unsupported-major-minor-version-52-0) — Eritrean, Mar 24 '21 at 15:10
Which Maven version do you use? Looks like the version that you use, doesn't support Java 7 anymore. — dunni, Mar 24 '21 at 15:10
@dunni EMBEDDED 3.63/1.16.0.20210129-0849, WORKSPACE NOT AVAILABLE [3.0,) — Lyra Orwell, Mar 24 '21 at 15:15
So you use the embedded Maven runtime in Eclipse, not on the command line? In that case, the minimum version of Eclipse is what counts, and i guess they already increased it to Java 8 (note, that this only refers to the runtime version, you can still run Eclipse with Java 8 and develop against JDK 7) — dunni, Mar 24 '21 at 15:22
So I need to install a downgraded version of eclipse? If so, which version would you recommend? A download link would be useful @dunni — Lyra Orwell, Mar 24 '21 at 15:25
No, as i said just run Eclipse with a higher Java version and use JDK 7 within your project settings as target JDK. — dunni, Mar 24 '21 at 15:30
And you should really think about updating your Java. Java 7 is really old, and it becomes harder and harder to work with this. — J Fabian Meier, Mar 24 '21 at 15:33
Just set your JAVA_HOME on Java 7 and build your project on plain command line. I suppose this will work. — khmarbaise, Mar 24 '21 at 16:17

score 1 · Answer 1 · answered Oct 01 '21 at 11:33

I ran into a similar issue, i was using a debug configuration to compile using Java 1.7. After updating Eclipse from veersion 4.17 to version 4.21, the build stopped working with a similar error:

Exception in thread "main" java.lang.UnsupportedClassVersionError: com/google/common/collect/ImmutableSet : Unsupported major.minor version 52.0

@dunni comment helped, it seems like the newest version of Eclipse embeds a new version of Maven 3.8.1 which seem to break the build. In my case, I just had to revert and install Maven locally (v3.5.3), then in Preferences > Maven > Installation > Add, use my local maven version, and the build succeeds

Dina · Accepted Answer · 2021-03-24T15:21:38.163

0

I believe, the value should be

<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>

Running through Eclipse IDE then java 7 should be selected under Java Build Path and Java Compiler

edited Mar 24 '21 at 15:21

answered Mar 24 '21 at 15:08

Dina

41
3

1

I still get the same error: Exception in thread "main" java.lang.UnsupportedClassVersionError: com/google/common/collect/ImmutableSet : Unsupported major.minor version 52.0 – Lyra Orwell Mar 24 '21 at 15:10
How you are running the code. Through command line or through IDE? – Dina Mar 24 '21 at 15:15
Through IDE @Dina – Lyra Orwell Mar 24 '21 at 15:15
Are you using Eclipse or IntelliJI? Did you check the Project compile java version and JRE that is used by IDE? – Dina Mar 24 '21 at 15:16
Eclipse, Ill edit my question to show project facets – Lyra Orwell Mar 24 '21 at 15:17

Maven Dependencies of an incorrect version

2 Answers2