TL;DR For experienced readers: Find the Java path; it looks like this: C:\Program Files\Java\jdkxxxx\bin\ Start-menu search for “environment variable” to open the options dialog. Examine PATH. Remove old Java paths. Add the new Java path to PATH. Edit JAVA_HOME. Close and re-open console/IDE. Welcome! You have encountered one of the most notorious technical issues facing … Read more
I had the same issue when “downgrading” a project from Java 8 to Java 6. The reason was that it was not changed at all places in IntelliJ. In IntelliJ 13.1.4 I had to change Java and SDK version on the following places not to get this error: File -> Project Structure -> Project Settings … Read more
Ant Runtime Simply set includeantruntime=”false”: <javac includeantruntime=”false” …>…</javac> If you have to use the javac-task multiple times you might want to consider using PreSetDef to define your own javac-task that always sets includeantruntime=”false”. Additional Details From http://www.coderanch.com/t/503097/tools/warning-includeantruntime-was-not-set: That’s caused by a misfeature introduced in Ant 1.8. Just add an attribute of that name to the … Read more
This is a bug in javac starting from JDK 9 (which made some changes with regard to string concatenation, which I suspect is part of the problem), as confirmed by the javac team under the bug id JDK-8204322. If you look at the corresponding bytecode for the line: array[i++%size] += i + ” “; It … Read more