I am not able to run or create any Java projects in Ubuntu 18.04 using Eclipse, NetBeans or IntelliJ Idea.
Results of which java :
Oracle java SE
Results of java -version :
java 8
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karel
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java SE and java 8 – Denes Vaghani Aug 10 '18 at 04:29
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Your Java path is buggered up because you installed Oracle Java SE. Your IDEs will recognize Java automatically if you uninstall Oracle JavaSE and install openjdk-8-jdk from the default Ubuntu 18.04 repos. This is how to install Eclipse and NetBeans in Ubuntu 18.04: https://askubuntu.com/questions/1045090/java-problem-with-eclipse-and-netbeans/1045101#1045101. The eclipse snap package also automatically recognizes the latest Java version in 18.04, default-jdk because it's more up-to-date than the eclipse apt package. – karel Aug 10 '18 at 04:48