Unfortunately there is no java equivalent to protoc - it's a long standing
feature request. I can't blame them though - it's a lot more work to keep
two compilers in sync with each other. For now the best you can do is:
1) pre-compile the FileDescriptorSet representation of a proto file and use
those to initialize
2) invoke protoc at run time from java (not as hard as it sounds)...
here's some snippets glued together... protoc, gen_src, and protoFile are
all File objects. And notably, you can install proco in the PATH, you can
provide the path to it to the app, or you can even bundle it inside a jar.
final String command = protoc.getPath() + " -o" +
gen_src.getName()
+ " " + protoFile.getName();
final Process process;
try {
process = Runtime.getRuntime().exec(command, null,
workingDir);
} catch (IOException e) {
}
int result;
try {
result = process.waitFor();
} catch (InterruptedException e) {
continue;
}
if (result == 0) {
// Success!
final FileInputStream input = new FileInputStream(gen_src);
fds = FileDescriptorSet.parseFrom(input);
input.close();
}
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