Error: A JNI error has occurred, please check your installation and try again

[row25505]

 opengrok-indexer -J=-Djava.util.logging.config.file=/home/opengrok/logging.properties -a /root/software/opengrok-1.7.25/lib/opengrok.jar --  -s /home/opengrok/src -d /home/opengrok/data -H -P -S -G -W /home/opengrok/etc/configuration.xml -U http://localhost:8080/source
DEBUG:filelock:Attempting to acquire lock 140246563213608 on /tmp/-S-indexer.lock
DEBUG:filelock:Lock 140246563213608 acquired on /tmp/-S-indexer.lock
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/opengrok/indexer/index/Indexer has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:756)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:473)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:74)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:369)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:363)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:362)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:352)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
	at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:601)
Indexer command failed (return code 1)
DEBUG:filelock:Attempting to release lock 140246563213608 on /tmp/-S-indexer.lock
DEBUG:filelock:Lock 140246563213608 released on /tmp/-S-indexer.lock

i need help ,canyou help me?

[vladak]

You seem to be running Java 8 runtime (class version 52) while the OpenGrok Java classes need at least Java 11 (class version 55).

See e.g. https://stackoverflow.com/a/35866015/11582827

[vladak]

BTW we have been discussing with @ahornace last week to make the transition to Java 17.

[row25505]

您似乎正在运行 Java 8 运行时（类版本 52），而 OpenGrok Java 类至少需要 Java 11（类版本 55）。

参见例如https://stackoverflow.com/a/35866015/11582827

Thank you! But ,i don`t understand. II have installed java-1.8 0-openjdk

[row25505]

顺便说一句，我们上周一直在与@ahornace讨论过渡到 Java 17。

After Google search, I installed java-11-opensdk, and I encountered new problems,DEBUG:filelock:Attempting to acquire lock 139895810412840 on /tmp/-S-indexer.lock
DEBUG:filelock:Lock 139895810412840 acquired on /tmp/-S-indexer.lock
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.UnsupportedClassVersionError: org/opengrok/indexer/index/Indexer has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:495)
Indexer command failed (return code 1)
DEBUG:filelock:Attempting to release lock 139895810412840 on /tmp/-S-indexer.lock
DEBUG:filelock:Lock 139895810412840 released on /tmp/-S-indexer.lock

Tomcat version is too low. It seems that it is only 9

[vladak]

see https://github.com/oracle/opengrok/wiki/How-to-setup-OpenGrok#requirements for the minimum versions

[row25505]

最低版本见https://github.com/oracle/opengrok/wiki/How-to-setup-OpenGrok#requirements

thanks，i have used docker ,that is ok