Facing java.lang.NoClassDefFoundError while trying to run signal-cli

[berry-thawson]

I am using ubuntu 18.04. While trying to open signal-cli from command line, I had this issue first

OpenJDK 64-Bit Server VM warning: Ignoring option MaxPermSize; support was removed in 8.0
Missing required native library dependency: libsignal-client

Referred the #517 and followed the steps in https://github.com/AsamK/signal-cli/wiki/Provide-native-lib-for-libsignal. But, for some reason, it did not take up the java.library.path. So, I used jar cf to add the .so files to the jar as follows:

zip -d ./signal-client-java-*.jar libsignal_jni.so
zip -d ./zkgroup-java-*.jar libzkgroup.so
jar cf ~/signal/signal-cli-0.8.4/zkgroup-java-0.7.0.jar ~/signal//zkgroup-0.7.3/target/release/libzkgroup.so
jar cf ~/signal/signal-client-java-0.8.1.jar ~/signal/libsignal-client-0.8.2/target/release/libsignal_jni.so

After this, if I try to run the signal-cli, I get following error:

signal-cli-0.8.4$ ./bin/signal-cli -u +XXXXXXXXXXXX register
OpenJDK 64-Bit Server VM warning: Ignoring option MaxPermSize; support was removed in 8.0
Exception in thread "main" java.lang.NoClassDefFoundError: org/whispersystems/libsignal/InvalidKeyException
	at org.asamk.signal.commands.Commands.<clinit>(Commands.java:11)
	at org.asamk.signal.App.buildArgumentParser(App.java:79)
	at org.asamk.signal.Main.main(Main.java:45)
Caused by: java.lang.ClassNotFoundException: org.whispersystems.libsignal.InvalidKeyException
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
	... 3 more

Can you help me out here? I am clueless, how to proceed.

[exquo]

Try replacing your commands with

cd <..dir with libsignal_jni.so file..>
zip -u <...>/signal-cli-0.8.4/lib/signal-client-java-0.8.1.jar libsignal_jni.so

But first, restore the original .jar files from the signal-cli release. I think jar cf overwrites rather than updates the .jar files, so that now your files contain only libsignal_jni.so and libzkgroup.so.

Note that the libsignal_jni.so file should be in the current working directory (that's what the first cd command above is for). If you specify a full path (e.g. ~/soft/signal/libsignal_jni.so) as an argument to zip, it will nest the full path subdirectories inside the archive, which is not what you want.

"Missing libsignal-client" must be caused by old glibc, like #643.

[berry-thawson]

That works.
Thank you @exquo . But, still I am getting a failure.

Exception in thread "main" java.lang.NullPointerException
	at org.asamk.signal.commands.RegisterCommand.handleCommand(RegisterCommand.java:30)
	at org.asamk.signal.App.handleRegistrationCommand(App.java:201)
	at org.asamk.signal.App.init(App.java:166)
	at org.asamk.signal.Main.main(Main.java:51)

It is solved if we give captcha. Though, some proper error message should be given. Everything works fine.