Deprecated warnings cause build failures with JDK 20

OS:
Arch Linux

Package versions:

• jdk-openjdk: 20.0.1.u9
• maven: 3.8.7
• ctags: 6.0.0
• java-jsvc: 1.3.3
• eclipse-ecj: 4.22

Several deprecated warnings are generated when running mvn:

[WARNING] COMPILATION WARNING : 
[INFO] -------------------------------------------------------------
[WARNING] /build/opengrok/src/opengrok/opengrok-indexer/src/main/java/org/opengrok/indexer/framework/PluginFramework.java:[385,18] java.security.AccessController in java.security has been deprecated and marked for removal
[WARNING] /build/opengrok/src/opengrok/opengrok-indexer/src/main/java/org/opengrok/indexer/util/Executor.java:[402,43] getId() in java.lang.Thread has been deprecated
[WARNING] /build/opengrok/src/opengrok/opengrok-indexer/src/main/java/org/opengrok/indexer/logger/formatter/LogFormatter.java:[96,23] getThreadID() in java.util.logging.LogRecord has been deprecated
[WARNING] /build/opengrok/src/opengrok/opengrok-indexer/src/main/java/org/opengrok/indexer/configuration/OpenGrokThreadFactory.java:[47,59] getId() in java.lang.Thread has been deprecated
[WARNING] /build/opengrok/src/opengrok/opengrok-indexer/src/main/java/org/opengrok/indexer/web/Util.java:[682,19] URL(java.lang.String) in java.net.URL has been deprecated
[WARNING] /build/opengrok/src/opengrok/opengrok-indexer/src/main/java/org/opengrok/indexer/web/Util.java:[1457,19] URL(java.lang.String) in java.net.URL has been deprecated
[WARNING] /build/opengrok/src/opengrok/opengrok-indexer/src/main/java/org/opengrok/indexer/web/Util.java:[1474,19] URL(java.lang.String) in java.net.URL has been deprecated
[INFO] 7 warnings 
[INFO] -------------------------------------------------------------
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] /build/opengrok/src/opengrok/opengrok-indexer/src/main/java/org/opengrok/indexer/authorization/AuthorizationFramework.java: warnings found and -Werror specified
[INFO] 1 error

Full build log: opengrok-1.11.7-1-x86_64-build.log

[vladak]

Thanks for the report ! While OpenGrok is currently on Java 11 (and the switch to Java 17 is considered - #3899), it definitely would not hurt to address these. Is this something you'd like to work on ?

Unfortunately I've not touched java code in over 15 years, so this is just a friendly heads-up rather than a volunteer to fix it. :)

Thanks for working on Opengrok!

[xbreizh]

@vladak Hi, I can take a look if that's fine?

[vladak]

@vladak Hi, I can take a look if that's fine?

Sure, all issues are generally open to public :-)

[vladak]

The URL class related warnings were addressed in #4750.

[vladak]

The trouble with Thread.getId() is that until we switch the target bytecode to 19+ (which introduced the Thread.threadId() method) it has to stay that way unless we resort to reflection or conditional compilation.