CentOS

Well, the short answer is I tried that, and did not see any change in behavior. I had installed a lot of extra java packages from the Centos repos, in the hope that something would fix my issue: # yum list installed | grep java icedtea-web-javadoc.noarch 1.7.1-1.el7 @base java-1.7.0-openjdk.x86_64 1...

It's true that the pointed-to java executable comes from the 'headless' package, but so does almost all the other java stuff. Here are the only things installed by the 'regular' java-1.8.0.-openjdk: # rpm -ql java-1.8.0-openjdk /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.171-7.b10.el7.x86_64/jre/bin/polic...

That is an interesting question. I don't even know how to tell the "headless" from the regular java. With the exception of a single .so file, he only files installed by the "java-1.8.0-openjdk-headless.x86_64" rpm package that have the text "headless" in the filename are documentation files. # repoq...

I downloaded an oracle java 8 .tar.gz file (not the latest, it turns out) from: http://javadl.oracle.com/webapps/download/AutoDL?BundleId=207765 and unpacked it into /opt. I find that it's javaws executable can run the .jnlp file without any error messages (or wait): ========== [T3 ~]$ /opt/jre1.8.0...

I removed the java-1.8.0* and icedtea* packages via yum, then installed all the java-1.8.0 packed in the repositories, followed by the three icedtea packages. Now I have: [T3 ~]# yum list installed | egrep "java-1.8.0|icedtea" icedtea-web.x86_64 1.7.1-1.el7 @base icedtea-web-devel.noarch 1.7.1-1.el7...

I can try to persuade javaws to not fail this "Headless check" via: ===== [T3 ~]$ export JAVA_TOOL_OPTIONS="-Djava.awt.headless=true" ===== This makes javaws fail differently: ========== [T3 ~]$ javaws ./Downloads/launch.jnlp Picked up JAVA_TOOL_OPTIONS: -Djava.awt.headless=true Picked up JAVA_TOOL_...

After upgrading from centos 7.4.1708 to Centos 7.5.1804 via yum, I get the following error while trying to run a .jnlp file via javaws: ========== [T3 ~]$ javaws Downloads/launch.jnlp Headless check failed. You are forced to run without any graphics. IcedTea-Web can run like this, but your app proba...

That worked! (I did all three commands.) Thanks very much!

I have a Centos 1RU system at version 7.4.1708: [root@w ~]# cat /etc/redhat-release CentOS Linux release 7.4.1708 (Core) [root@w ~]# Now that 7.5.1804 is out I thought that yum would update the 'w' machine. It did so successfully update another Centos machine of mine. But: [root@w ~]# yum repolist L...

OK, thanks.