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I want to compile my .java's (several) into one .jar that are compatible with at least Java 1.6 and newer, preferably Java 1.5 and newer versions of Java. (I have Java 1.7.0_5)
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Compiling for an older execution platform If you need to compile Java to run on an older Java platforms, the simplest approach is to install a JDK for the oldest version you need to support, and use that JDK's compiler in your builds. You can also compile with a newer Java compiler, but there are complicated.
As answered already you are mostly safe and most products and 3rd party libraries will simply work. However there do exist very rare cases where binary incompatibilities (ones where the class file compiled using older JDK will fail to run in the newer JVM) were introduced between JDK versions.
Yes, you can set the version of compiler at compile time. And compile your java code into old versions of java.
From Oracle article : http://docs.oracle.com/javase/1.5.0/docs/tooldocs/windows/javac.html
Cross-Compilation Example
Here we use javac to compile code that will run on a 1.4 VM.
% javac -target 1.4 -bootclasspath jdk1.4.2/lib/classes.zip \ -extdirs "" OldCode.java You might also need following parameter to set denote the version of your code.
-source release -Specifies the version of source code accepted.
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As of JDK 9, javac support a new option for cross-compiling
javac --release N ... which is equivalent to
javac -source N -target N –bootclasspath rtN.jar If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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