how to use eclipse compiler instead of javac

JUnit 4, for example, will use reflection to look through your classes for methods tagged with the annotation, and will then call them when running the unit test.

One very common use case in Java is the usage with annotations. So, to give you a code example of this in Java (imagine the object in question is foo) : Method method = foo.getClass().getMethod('doSomething', null) Java's static typing system isn't really designed to support this unless the object conforms to a known interface, but using reflection, your code can look at the object and find out if it has a method called 'doSomething' and then call it if you want to. The name reflection is used to describe code which is able to inspect other code in the same system (or itself).įor example, say you have an object of an unknown type in Java, and you would like to call a 'doSomething' method on it if one exists. IntelliJ IDEA has support for ECJ, as of GNU Compiler for Java (GCJ) 4.3,.Apache Tomcat uses ECJ to compile JSPs,.The fact that Eclipse comes with its own compiler is also apparent because you can write, compile, and run Java code in Eclipse without even installing the Java SDK.Ī few examples where ECJ is preferred over javac is: Otherwise, it will throw an exception indicating that you tried to run code that doesn't compile.Īnother difference is that the Eclipse compiler allows for incremental builds from within the Eclipse IDE, that is, all code is compiled as soon as you finish typing. If the block of code with the error is never ran, your program will run fine. One notable difference is that the Eclipse compiler lets you run code that didn't actually properly compile. It is different from the javac, the compiler that is shipped with Sun JDK. Eclipse has implemented its own compiler called as Eclipse Compiler for Java (ECJ).

How to use eclipse compiler instead of javac