CODEWITHSUNDEEP
java
mhrsalehi
mhrsalehi

Reputation: 1394

error "class file has wrong version 55.0, should be 52.0" when building Alfresco

I Generated a project from the Maven Alfresco archetypes:

mvn archetype:generate -Dfilter=org.alfresco:

when I try to build it fails:

[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /D:/Mehrdad/alfresco/alfresco-platform/src/main/java/com/mehr/alfresco/platformsample/HelloWorldWebScript.java:[20,49] cannot access org.springframework.extensions.webscripts.Cache
  bad class file: C:\Users\mehrdad.s\.m2\repository\org\alfresco\surf\spring-webscripts\7.9\spring-webscripts-7.9.jar(org/springframework/extensions/webscripts/Cache.class)
    class file has wrong version 55.0, should be 52.0
    Please remove or make sure it appears in the correct subdirectory of the classpath.
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for AIO - SDK 4.0 1.0-SNAPSHOT:
[INFO]
[INFO] AIO - SDK 4.0 ...................................... SUCCESS [  1.063 s]
[INFO] Alfresco Platform/Repository JAR Module ............ FAILURE [01:54 min]
[INFO] Alfresco Share JAR Module .......................... SKIPPED
[INFO] Integration Tests Module ........................... SKIPPED
[INFO] Alfresco Platform/Repository Docker Module ......... SKIPPED
[INFO] Alfresco Share Docker Module ....................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  02:02 min
[INFO] Finished at: 2020-03-10T09:42:54+03:30
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project alfresco-platform: Compilation failure
[ERROR] /D:/Mehrdad/alfresco/alfresco-platform/src/main/java/com/mehr/alfresco/platformsample/HelloWorldWebScript.java:[20,49] cannot access org.springframework.extensions.webscripts.Cache
[ERROR]   bad class file: C:\Users\mehrdad.s\.m2\repository\org\alfresco\surf\spring-webscripts\7.9\spring-webscripts-7.9.jar(org/springframework/extensions/webscripts/Cache.class)
[ERROR]     class file has wrong version 55.0, should be 52.0
[ERROR]     Please remove or make sure it appears in the correct subdirectory of the classpath.

D:\Mehrdad\alfresco>java -version
java version "1.8.0_231"
Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)

D:\Mehrdad\alfresco>javac -version
javac 1.8.0_231

as you see the java and javac are 8. I have no idea how to solve this problem.

what is the problem?

Upvotes: 25

Views: 125951

Answers (6)

Pratik Gaurav
Pratik Gaurav

Reputation: 907

Okay, I know it's late to answer the question. However it's never too late.

This issue comes when an API compiled on JDK 11 i.e. major.minor version 55, and your source code is on JDK 8.

We can solve it in many ways.

  1. if maven project we can either choose JDK 11 or JDK 17 by either using

For JDK 17

<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>

or

<java.version>17</java.version>

when using JDK 11

<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>

or

<java.version>11</java.version>

  1. Eclipse Change JRE

  2. Intellij Change JRE

Upvotes: 4

gene b.
gene b.

Reputation: 11984

If running from Eclipse (e.g. Maven commands), ensure the right JDK Version is used, under the JRE tab, to avoid any errors in JARs compiled from different JDKs.

enter image description here

Upvotes: 0

Bastien Gallienne
Bastien Gallienne

Reputation: 168

It happened for me with a pom.xml dependency which version was throwing the error. (the java and javac versions were the same). The solution was to try other versions of the same dependency, which I finally found by downgrading the versions one after the other and try. And finally it compiled fine. :)

Upvotes: 0

Daniel Paul
Daniel Paul

Reputation: 514

Well, I know its late to post answer for this, but if it helps anyone.

So the issue is because you have jar file compiled with different versions of java.

Here "Alfresco Platform/Repository JAR Module" is compiled on different version of java than the rest of the module in the project.

If you keep the version similar across the modules then the error will go away.

Upvotes: 4

jose praveen
jose praveen

Reputation: 1316

from your stacktrace spring-webscripts-7.9.jar is compiled with jdk 11. so you got this error (class file has wrong version 55.0, should be 52.0).

build version

Solution: Change spring-webscripts-7.9 to spring-webscripts.7.2 as your system has java 8 version. No need upgrade Java 8 to Java 11.

add the below dependency in your pom.xml file

<!-- https://mvnrepository.com/artifact/org.alfresco.surf/spring-webscripts -->
<dependency>
    <groupId>org.alfresco.surf</groupId>
    <artifactId>spring-webscripts</artifactId>
    <version>7.2</version>
</dependency>

I hope this helps.

Upvotes: 0

rieckpil
rieckpil

Reputation: 12021

It complains that some class files were compiled using Java 11 (which is Java 55.0, List of Java class file format major version numbers?) and you try to compile the rest with Java 8.

You should update your local Java version to at least Java 11 and then try to re-compile again

Upvotes: 36

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