Node JS Trireme include module

Question

I'm running Node JS with https://github.com/apigee/trireme from Java, inside the JVM. I have a directory that looks as following:

node/
-test_file.js
-test_somemodule.js
-somemodule/
-somemodule/index.js
-somemodule/...

I have no problem running the test_file.js using this code:

@Test
public void shouldRunTestScript() {
    try {
        NodeEnvironment env = new NodeEnvironment();
        // Pass in the script file name, a File pointing to the actual script, and an Object[] containg "argv"
        NodeScript script = env.createScript("my-test-script.js",
                new File(Settings.getInstance().getNodeDir() + "/my-test-script.js"), null);
        // Wait for the script to complete
        ScriptStatus status = script.execute().get();
        // Check the exit code
        assertTrue("Exit code was not 77.", status.getExitCode() == 77);
    } catch (NodeException | InterruptedException | ExecutionException ex) {
        Logger.getLogger(TriremeTest.class.getName()).log(Level.SEVERE, null, ex);
        fail("Trireme triggered an exception: " + ex.getMessage());
    }
}

In the file test_somemodule.js I include the index.js.

require('somemodule/index.js');

When I try to run that file, it can't find the file in the require. I have no knowledge about Node JS, so I'm not familiar with the module loading. I already tried setting NODE_PATH, only to get

Error: Cannot find module 'request'

It seems like I can't obtain the NODE_PATH from Trireme, and if I overwrite it, Trireme fails to run. I'm out of ideas on how I could get an Node JS module loaded in Trimere. Any help appreciated.

Edit: I changed the require to ('./somemodule/index.js'), which works. So setting the NODE_PATH would have done the job too. I just found out the error came from an missing dependency.

  "dependencies": {
"request": "^2.49.0",
"tough-cookie": "^0.12.1"
 },

I figured out the best way to deal with it is installing Node JS + npm, and invoking npm install some_module in the node/ folder. It automatically downloads some_module and all of its dependencies into my node/ folder. No more require errors.

@E_net4 Yep, it does :D Would you recommend creating an answer or just leaving the question as it is? — Zackline, Jun 06 '15 at 12:49
Do **not** leave the question as it is. Move the answer part to an answer of your own. — E_net4, Jun 06 '15 at 12:50
@E_net4 That's what I initially used to do, but I was discouraged by having to wait before I can accept my own answers. I think the amount of time you have to wait increases with each answer you accept from yourself. That made me think that it was a bad thing to answer your own questions. — Zackline, Jun 06 '15 at 12:59
Waiting is natural and should not be a discouragement. On the other hand, leaving a question apparently unanswered is much worse. — E_net4, Jun 06 '15 at 13:01

score 2 · Accepted Answer · answered Jun 06 '15 at 12:55

I did not specify that the file was in the working directory.

require('./somemodule/index.js');

instead of

require('somemodule/index.js');

did the job. Another possiblity is to set the NODE_PATH environment variable to the node/ folder, so you can require without ./.

I also figured out that the best way to obtain modules is by installing them with npm instead of downloading them from git, because the latter does not download any dependencies.

Node JS Trireme include module

1 Answers1