我想從另一個類編譯一個類,但是我使用的每個方法都會拋出一個NullPointerException異常。JavaCompiler,StandardJavaFileManager引發NPE
下面的代碼:
File fRun = new File(fileToRun);
DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>();
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
// NPE IN NEXT LINE
StandardJavaFileManager fileManager = compiler.getStandardFileManager(diagnostics, null, null);
Iterable<? extends JavaFileObject> compUnits = fileManager.getJavaFileObjects(fRun);
compiler.getTask(null, fileManager, null, null, null, compUnits).call();
fileManager.close();
或
public static void main(String[] args) {
String fileToCompile = "test" + java.io.File.separator + "MyClass.java";
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
// NPE IN NEXT LINE
int compilationResult = compiler.run(null, null, null, fileToCompile);
if (compilationResult == 0) {
System.out.println("Compilation is successful");
} else {
System.out.println("Compilation Failed");
}
}
從http://www.javabeat.net/articles/73-the-java-60-compiler-api-1.html
我開始從Eclipse的程序。
Wheres the mistake?
不能訪問源ATM,但我想我使用JRE 1.7運行它 – ctekk 2012-03-08 15:51:20