I had some issues with an .jnlp file using OpenJDK so I installed Oracle Java. It didn't work either, so I uninstalled it (the config folder is still there though).
Now, if I want to open something with IcedTea, it tries to use Oracle Java, although no longer installed (if I interpret the terminal output correctly).
$ javaws FILENAME.jnlp
selected jre: /usr/lib/jvm/java-11-oracle
thread 'main' panicked at 'Error spawning JVM process, java executable: [/usr/lib/jvm/java-11-oracle], arguments: [["-splash:/usr/share/icedtea-web/javaws_splash.png", "-Xbootclasspath/a:/usr/share/icedtea-web/javaws.jar:/usr/share/java/js.jar:/usr/share/java/tagsoup.jar:/usr/lib/jvm/java-11-oracle/lib/ext/nashorn.jar:", "-classpath", "/usr/lib/jvm/java-11-oracle/lib/rt.jar:/usr/lib/jvm/java-11-oracle/lib/ext/jfxrt.jar:", "-Dicedtea-web.bin.name=javaws", "-Dicedtea-web.bin.location=/usr/lib/icedtea-web/bin/javaws", "net.sourceforge.jnlp.runtime.Boot", "FILENAME.jnlp"]]', src/os_access.rs:36:19
note: Run with RUST_BACKTRACE=1 for a backtrace.
I tried reinstalling OpenJDK and IcedTea.
$ java - version
openjdk version "11.0.2" 2019-01-15
OpenJDK Runtime Environment (build 11.0.2+9-Ubuntu-3ubuntu118.10.3)
OpenJDK 64-Bit Server VM (build 11.0.2+9-Ubuntu-3ubuntu118.10.3, mixed mode, sharing)
I have read along another question (How to set default Java version?) question and tried update-alternatives --config java; but it says there is only one java version and nothing to choose.
I assume I have to change something in the config files of IcedTea?
[edit] I also cannot access $itweb-settings, it comes up with the same error as in the first box. I'm about to install oracle java, then hopefully change iced tea's configuration and then uninstall it again.
$ sudo update-alternatives --get-selections | grep ^java
java auto /usr/lib/jvm/java-11-openjdk-amd64/bin/java
javaws manual /usr/lib/icedtea-web/bin/javaws
