java-compiler-api

Is it possible to programmatically compile java source code in memory only?

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To start, look at the JavaCompiler API. Basically: Create the Java class in a string. Put the string into class that extends SimpleJavaFileObject. Compile using a JavaCompiler instance. Finally, call the methods the new class. Here is an example that works with JDK6+: import java.io.IOException; import java.io.PrintWriter; import java.io.StringWriter; import java.lang.reflect.InvocationTargetException; import java.net.URI; import java.util.Arrays; … Read more

What is the difference between using javac and javax.tools.JavaCompiler?

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javac (as “java compiler”) is an executable, which could be theoretically even a platform-dependent executable or a script. This is called to compile a .java to a .class. On windows is its name javac.exe, and it is normally somewhere below C:\Program Files*\jdk*\bin. This compiler was developed in java as well. That means, if we start … Read more

How to set classpath when I use javax.tools.JavaCompiler compile the source?

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The javax.tools.JavaCompiler#getTask() method takes an options parameter that allows to set compiler options. The following message describes an easy way to set them in order to access the calling program’s classpath: You need to configure the standard java file manager to know about the jar files(s) – you use the compiler options argument to do … Read more

Compile code fully in memory with javax.tools.JavaCompiler [duplicate]

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I’ve run the above code in Mac OS Java 7. None of them works. So i wrote one https://github.com/trung/InMemoryJavaCompiler StringBuilder source = new StringBuilder() .append(“package org.mdkt;\n”) .append(“public class HelloClass {\n”) .append(” public String hello() { return \”hello\”; }”) .append(“}”); Class<?> helloClass = InMemoryJavaCompiler.compile(“org.mdkt.HelloClass”, source.toString());

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