SEVERE: Running with Java class version 53.0, but 52.0 is required error with Jenkins through command prompt as "java -jar jenkins.war"

Question

I am automation engineer i have deployed my build on the Jenkins using maven, I want to when scripts are executed then the browser should open. I searched on it some peoples says my me Run the Jenkins war file through cmd prompt when I am trying to Run the Jenkins through command prompt as:

java -jar Jenkins.war 

Then the system generates an error as follows:

SEVERE: Running with Java class version 53.0, but 52.0 is required error

Anyone have any idea how I can fix the problem?

Answer 1

This error message...

SEVERE: Running with Java class version 53.0, but 52.0 is required.

...implies that you have tried to initialize Jenkins on a system which is using java class version 53.0 which stands for Java 9.

As per the Jenkins documentation on Java requirements the following are mentioned:

• Java 8 is the ONLY supported runtime environment, both 32-bit and 64-bit versions are supported.
• Older versions of Java are not supported.
• Java 9 is not supported.
• Java 10 and Java 11 preview support is available.
• Support of these versions is available through custom packages
• Running Jenkins with Java 10 and 11 (experimental support) page provides guidelines about running Jenkins with these versions.
• These requirements apply to all components of the Jenkins system including Jenkins master, all types of agents, CLI clients, and other components.

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Solution

There are two possible solutions as follows:

• You can downgrade your Jenkins host JRE to Java 8 version and initiate Jenkins as follows:

  ${JAVA8_HOME}/bin/java -jar jenkins.war
  

• You can upgrade your Jenkins host JRE to Java 10 or Java 11 version and initiate Jenkins along with the --enable-future-java flag as follows:

  ${JAVA10_HOME}/bin/java -jar jenkins.war --enable-future-java
  

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Running Jenkins (without Docker)

Java 10

• Download Jenkins WAR for 2.127 or above (or build the experimental branch)

• Run the Jenkins WAR file with the following command:

  ${JAVA10_HOME}/bin/java --add-modules java.xml.bind -jar jenkins.war \
      --enable-future-java --httpPort=8080 --prefix=/jenkins
  

Java 11

• Download Jenkins WAR for 2.127 or above (or build the experimental branch)
• Download the following libraries to the same directory as jenkins.war
  • jaxb-api-2.3.0.jar (save as jaxb-api.jar)
  • jaxb-core-2.3.0.1.jar (save as jaxb-core.jar)
  • jaxb-impl-2.3.0.1.jar (save as jaxb-impl.jar)
  • javax.activation v.1.2.0 (save as javax.activation.jar)

• Run the Jenkins WAR file with the following command:

  ${JAVA11_HOME}/bin/java \
      -p jaxb-api.jar:javax.activation.jar --add-modules java.xml.bind,java.activation \
      -cp jaxb-core.jar:jaxb-impl.jar \
      -jar jenkins.war --enable-future-java --httpPort=8080 --prefix=/jenkins
  

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trivia

As per Java class file - Wikipedia following are the major version number of the class file format being used:

Java SE 11 = 55
Java SE 10 = 54
Java SE 9 = 53
Java SE 8 = 52
Java SE 7 = 51
Java SE 6.0 = 50
Java SE 5.0 = 49
JDK 1.4 = 48
JDK 1.3 = 47
JDK 1.2 = 46
JDK 1.1 = 45