public int compileJava() {
try {
// create new bin directory
boolean createBin = new File(classPath).mkdir();
// create new javac ProcessBuilder
// ProcessBuilder pb =
// new ProcessBuilder("javac", "-d", classPath, "./" + studentPath + "/*.java");
ProcessBuilder pbDir = new ProcessBuilder("dir");
// Determine current working directory
File srcAbsPath = new File(sourcePath);
srcAbsPathName = srcAbsPath.getAbsolutePath();
System.out.println("Compiler.java line 69 source path: " + sourcePath);
System.out.println("Compiler.java line 69 source absolute path: " + srcAbsPathName);
File cwd = pbDir.directory();
// debug code - to confirm correct directory
// TestTools.dir(cwd);
// NB - ProcessBuilder default is to return a null
// pointer for the abstract path to indicate that it
// is using System.Properties "user.dir", i.e., the
// current system working directory; hence the
// critical need to handle a NullPointerException.
// Also returns a null pointer if the directory
// doesn't exist.
// all this is doing is changing the dir, can we approach this in a different way using a
// value in our Data Object? -mh
File nwd = TestTools.cd(cwd, studentPath);
System.out.println("(Compiler.java line 88)new working directory: " + nwd.toString());
String studentPathName = nwd.getAbsolutePath();
File nwdPath = new File(studentPath);
System.out.println("(Compiler.java line 91)new working directory path: " + studentPathName);
// debug code to test new working directory
// TestTools.dir(nwd);
FileFilter filter = new FileFilter() {};
String[] javaFileList = nwdPath.list(filter);
// set up output file
File outputFile = new File(outputFileName);
// System.out.println(outputFileName);
outputFile.delete();
for (int k = 0; k < javaFileList.length; k++) {
try {
if (filter.accept(nwdPath, javaFileList[k]) == true) {
System.out.println("COMPILER.JAVA (line 111) Compiling: " + javaFileList[k]);
String compilePath =
"javac" + "-d" + classPath + ".\\" + studentPath + "\\" + javaFileList[k];
System.out.println("Compiler.java 117 compile path: " + compilePath);
ProcessBuilder pb =
// new ProcessBuilder("javac ", "-d", classPath, ".\\" + studentPath + "\\" +
// javaFileList[k]);
new ProcessBuilder(compilePath);
// System.out.println(pb.environment().toString()); <-- THIS IS VERY INTERESTING
// Create environment map and set environmental variables
Map<String, String> env = pb.environment();
env.clear();
env.put("PATH", path);
env.put("CLASSPATH", classPath);
// env.put("SOURCEPATH", sourcePath);
// env.remove("OTHERVAR");
pb.redirectErrorStream(true);
pb.redirectOutput(Redirect.appendTo(outputFile));
// start javac process
Process p = pb.start();
// need other processes to wait for compilation to finish
// basically joins the thread to the javac process to force sequential
// execution - need to be careful - if any process hangs, whole run hangs
success =
p
.waitFor(); // Returns the exit value of the process. By convention, 0 indicates
// normal termination.
// http://docs.oracle.com/javase/6/docs/api/java/lang/Process.html#waitFor%28%29
assert pb.redirectInput() == Redirect.PIPE;
assert pb.redirectOutput().file() == outputFile;
assert p.getInputStream().read() == -1;
System.out.println("COMPILER.JAVA (line 138) end of loop, success = " + success);
}
} catch (Exception e) {
System.out.println(" Compiler.java FOR LOOP Compile Exception: " + javaFileList[k]);
}
}
} catch (Exception e) {
System.out.println("Compile Exception, PROBABLY DUE TO FILE PATH");
System.out.println("source absolute path: " + srcAbsPathName);
}
return success;
}
