Load a Class from a String with java

Question

I use this code to create a Class and an Instance from a java byte code

Class aClass = container.getByteCode();
    o = aClass.newInstance();

I want to do the same thing but with java source code ( String ) instead.

aClass = container.getJavaCode()...

you will need some compiler to transform the source code into byte code. — mschenk74
– mschenk74, Commented Jul 11, 2014 at 22:04
And you'll need someone else to rethink your design because it's very, very rare that this is the only solution to a problem. — christopher
– christopher, Commented Jul 11, 2014 at 22:05
What you want to do is done with Java Server Pages (JSP), I believe. (If not JSP then one of the other similar kits.) There is a way to access javac within a Java program. But it's not simple, and I'm not sure how "general" it is. — Hot Licks
– Hot Licks, Commented Jul 11, 2014 at 22:27
Similar question from yesterday: stackoverflow.com/questions/24665848/… — aliteralmind
– aliteralmind, Commented Jul 11, 2014 at 22:34

David Ehrmann · Accepted Answer · 2014-07-11 22:06:04Z

0

You're going to need a Java compiler for that. The Eclipse Compiler for Java was written in Java, and can run as a standalone compiler, so it should be pretty easy to either hook into another entry point or add another entry point. I'm not sure how hard it would be to make it compile against the current classpath (classloader, really) rather than rt.jar.

There's also broadening your requirements a bit and using a Groovy interpreter (Groovy's at least a superset of Java), or even switch to Javascript (Java ships with a JS engine) or Ruby.

answered Jul 11, 2014 at 22:06

David Ehrmann

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