How to compile sources at runtime

Before compiling sources at runtime you must create sources: to do this follow this guide. Once the sources have been generated you can compile them with the JavaMemoryCompiler as follow:

package source.compilation.test;


import org.burningwave.core.assembler.ComponentContainer;
import org.burningwave.core.classes.JavaMemoryCompiler;
import org.burningwave.core.classes.JavaMemoryCompiler.Compilation;
import org.burningwave.core.concurrent.QueuedTasksExecutor.ProducerTask;
import org.burningwave.core.io.FileSystemItem;

import source.generation.test.SourceGenerationTester;

public class SourceCompilationTester {
    
    
    public static void main(String[] args) throws ClassNotFoundException {
        ComponentContainer componentContainer = ComponentContainer.getInstance();
        JavaMemoryCompiler javaMemoryCompiler = componentContainer.getJavaMemoryCompiler();
        ProducerTask<Compilation.Result> compilationTask = javaMemoryCompiler.compile(
            Compilation.Config.forUnitSourceGenerator(
                SourceGenerationTester.generate()
            )
            .storeCompiledClassesTo(
                System.getProperty("user.home") + "/Desktop/classes"
            )
        );
        
        Compilation.Result compilationResult = compilationTask.join();
        
        System.out.println("\n\tAbsolute path of compiled file: " + 
            compilationResult.getClassPath()
            .findFirstInAllChildren(
                FileSystemItem.Criteria.forAllFileThat(FileSystemItem::isFile)
            ).getAbsolutePath() + "\n"
        );
    }
    
}

You can also load the generated class files:

package source.compilation.test;

import static org.burningwave.core.assembler.StaticComponentContainer.ClassLoaders;
import static org.burningwave.core.assembler.StaticComponentContainer.Methods;

import org.burningwave.core.assembler.ComponentContainer;
import org.burningwave.core.classes.JavaMemoryCompiler;
import org.burningwave.core.classes.JavaMemoryCompiler.Compilation;
import org.burningwave.core.concurrent.QueuedTasksExecutor.ProducerTask;

import source.generation.test.SourceGenerationTester;

public class SourceCompilationTester {
    
    
    public static void main(String[] args) throws ClassNotFoundException {
        ComponentContainer componentContainer = ComponentContainer.getInstance();
        JavaMemoryCompiler javaMemoryCompiler = componentContainer.getJavaMemoryCompiler();
        ProducerTask<Compilation.Result> compilationTask = javaMemoryCompiler.compile(
            Compilation.Config.forUnitSourceGenerator(
                SourceGenerationTester.generate()
            )
            .storeCompiledClassesTo(
                System.getProperty("user.home") + "/Desktop/classes"
            )
        );
        
        Compilation.Result compilattionResult = compilationTask.join();
        
        ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
        ClassLoaders.addClassPaths(classLoader, compilattionResult.getDependencies());
        ClassLoaders.addClassPath(classLoader, compilattionResult.getClassPath().getAbsolutePath());
        Class<?> cls = classLoader.loadClass("source.generation.test.GeneratedClass");
        Methods.invokeStaticDirect(cls, "main", new Object[] {new String[] {"Hello", "world!"}});
    }
    
}