René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"NullPointerException","articleBody":"                `System.setProperty(\"java.home\", \"C:\\\\Program Files\\\\Java\\\\jdk-11.0.1\");\r\n\t\tStringBuilder sourceCode = new StringBuilder();\r\n\t\tsourceCode.append(\"package me.Perzan.compileString;\\n\");\r\n\t\tsourceCode.append(\"class HelloClass {\\n\");\r\n\t\tsourceCode.append(\"   public static void hello() { System.out.println(\\\"hello\\\"); }\");\r\n\t\tsourceCode.append(\"}\");\r\n\r\n\t\tInMemoryJavaCompiler compiler = InMemoryJavaCompiler.newInstance();\r\n\t\t\r\n\t\tcompiler.addSource(\"HelloClass\", sourceCode.toString());\r\n\t\t\r\n\t\t\r\n\t\t\r\n\t\tMap\u003cString, Class\u003c?\u003e\u003e classMap = compiler.compileAll();\r\n\t\t\r\n\t\tClass\u003c?\u003e helloClass = classMap.get(\"HelloClass\");\r\n\t\tMethod m = helloClass.getMethod(\"hello\");\r\n\t\t\r\n\t\tm.invoke(null);`\r\n\r\nSo at the line with 'Map\u003cString, Class\u003c?\u003e\u003e classMap = compiler.compileAll();' I get NullPointerException. I even set the property for JDK at the beginning. I'm not sure why this is happening, for my version is pretty much the same as your example...\r\n\r\n(Also the '`' things are not part of it, I was just trying to insert the code)\r\n\r\nAlso here is the stack trace:\r\n\r\n`\r\nException in thread \"main\" java.lang.NullPointerException\r\n\tat org.mdkt.compiler.InMemoryJavaCompiler.compileAll(InMemoryJavaCompiler.java:80)\r\n\tat me.Perzan.compileString.CompileTest.main(CompileTest.java:26)\r\n`","author":{"url":"https://github.com/Perzan","@type":"Person","name":"Perzan"},"datePublished":"2019-02-06T19:50:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/24/InMemoryJavaCompiler/issues/24"}