private File compileOne(Type type) { if (this.flags.contains(Flags.USECACHE)) { File dir = cache.get(type.getName()); if (dir != null) { return dir; } } List<JavaFileObject> files = new ArrayList<>(); SourceProcessor accum = (name, src) -> files.add(new SourceFile(name, src)); for (Type dep : type.typeDependencies()) { dep.generateAsDependency(accum, type.methodDependencies()); } type.generate(accum); JavacTask ct = (JavacTask) this.systemJavaCompiler.getTask(null, this.fm, null, null, null, files); File destDir = null; do { int value = counter.incrementAndGet(); destDir = new File(root, Integer.toString(value)); } while (destDir.exists()); if (this.flags.contains(Flags.VERBOSE)) { System.out.println("Compilation unit for " + type.getName() + " : compiled into " + destDir); for (JavaFileObject jfo : files) { System.out.println(jfo.toString()); } } try { destDir.mkdirs(); this.fm.setLocation(StandardLocation.CLASS_OUTPUT, Arrays.asList(destDir)); } catch (IOException e) { throw new RuntimeException( "IOException encountered during compilation: " + e.getMessage(), e); } Boolean result = ct.call(); if (result == Boolean.FALSE) { throw new RuntimeException("Compilation failure in " + type.getName() + " unit"); } if (this.flags.contains(Flags.USECACHE)) { File existing = cache.putIfAbsent(type.getName(), destDir); if (existing != null) { deleteDir(destDir); return existing; } } else { this.tempDirs.add(destDir); } return destDir; }