Java8

Why Java 8 is not dead

• Because Java 9 breaks things
• Because Java 10 breaks more things
• Because Java 11 breaks even more things
• Because Java >=12 will surely break more of the stuff that has been working perfectly for years

And the cost/benefit relation of moving along Oracle's ideas seems not worthwile.

Examples

Mediawiki-Japi

• Travis build suddenly fails

Problem

Mediawiki-Japi/src/main/java/com/bitplan/mediawiki/japi/api/Page.java:[34,33] package javax.xml.bind.annotation does not exist

Diagnosis

• https://stackoverflow.com/questions/43574426/how-to-resolve-java-lang-noclassdeffounderror-javax-xml-bind-jaxbexception-in-j

Oracle decided to remove APIs

Solution

Do not use Oracle's incompatible Java versions - stay with Version 8

diff --git a/.travis.yml b/.travis.yml
 # this is a java project using maven
 language: java
+# make sure things keep working see http://wiki.bitplan.com/index.php/Java8
+jdk: openjdk8

Crashing Eclipse

Problem

Trying to start Eclipse oxygen leads to multiple ClassNotFoundExceptions

Diagnosis

• https://bugs.eclipse.org/bugs/show_bug.cgi?id=533390
• https://stackoverflow.com/questions/48349760/how-do-i-change-my-eclipse-ides-launch-jvm

Therapy

Surprise - stay with Java 8 ... Search it:

/usr/libexec/java_home -v 1.8
/Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home

and add it to your eclipse.ini (make sure using two lines as below ...

-vm
/Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home/bin/java

Hazelcast not starting

Problem

java: WARNING: Hazelcast is starting in a Java modular environment (Java 9 and newer) but without proper access to required Java packages. Use additional Java arguments to provide Hazelcast access to Java internal API. The internal API access is used to get the best performance results. Arguments to be used:

java:  --add-modules java.se --add-exports java.base/jdk.internal.ref=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.nio=ALL-UNNAMED --add-opens java.base/sun.nio.ch=ALL-UNNAMED --add-opens java.management/sun.management=ALL-UNNAMED --add-opens jdk.management/com.sun.management.internal=ALL-UNNAMED

Diagnosis

Code not working without changes

Therapy

Surprise - stay with Java 8 ...