Compile java file at runtime if class has other dependencies

Asked Mar 08 '21 at 14:41

Active Mar 08 '21 at 14:41

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The implementation of the following functionality is required - the user writes code on the site, for example, a method or class in java is sent for verification. The system checks the code for compilation and tests the business logic of the method (or class). I know how to implement compilation at runtime of a "simple" class, for example: File classFile = new File("FirstTest.java"); Files.write(classFile.toPath(), source.getBytes(StandardCharsets.UTF_8));

JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();

OutputStream outputStreamErr = new ByteArrayOutputStream();
int compilingResult = compiler.run(null, null, outputStreamErr, classFile.getPath());

But when the compiled class contains any additional import (even just a collection, not to mention JUnit), then an error occurs during compilation. What are the options to resolve this issue. How can you add dependencies during dynamic compilation, or are there any other ways to implement this functionality?

asked Mar 08 '21 at 14:41

Distalker

JUnit isn’t built into Java SE. You have to specify the classpath in your compiler arguments. – VGR Mar 08 '21 at 17:05
Can I see an example somewhere – Distalker Mar 08 '21 at 17:27
`compiler.run(null, null, outputStreamErr, "-cp", "/path/to/junit.jar", classFile.getPath())` – VGR Mar 08 '21 at 19:08
Thank! I will try! – Distalker Mar 09 '21 at 05:31
Thank! it's work for me – Distalker Mar 09 '21 at 17:41

Compile java file at runtime if class has other dependencies

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