diff --git a/src/commands/dataize.js b/src/commands/dataize.js
index ac8f830..1dd6d68 100644
--- a/src/commands/dataize.js
+++ b/src/commands/dataize.js
@@ -32,15 +32,18 @@ const path = require('path');
  * @param {Hash} opts - All options
  */
 module.exports = function(obj, args, opts) {
-  spawn(
-    `java`,
-    [
-      '-Dfile.encoding=UTF-8',
-      `-Xss${opts.stack}`,
-      '-jar', path.resolve(opts.target, 'eoc.jar'),
-      obj,
-      ...args,
-    ],
-    {stdio: 'inherit'}
-  );
+  const params = [
+    '-Dfile.encoding=UTF-8',
+    `-Xss${opts.stack}`,
+    '-jar', path.resolve(opts.target, 'eoc.jar'),
+    obj,
+    ...args,
+  ]
+  console.debug('+ java ' + params.join(' '));
+  spawn('java', params, {stdio: 'inherit'}).on('close', (code) => {
+    if (code !== 0) {
+      console.error(`Java exited with #${code} code`);
+      process.exit(1);
+    }
+  });
 };
diff --git a/test/commands/test_dataize.js b/test/commands/test_dataize.js
index 7bf38b3..21fa1a5 100644
--- a/test/commands/test_dataize.js
+++ b/test/commands/test_dataize.js
@@ -31,29 +31,19 @@ describe('dataize', function() {
   it('runs a single executable .JAR and dataizes an object', function(done) {
     home = path.resolve('temp/test-run/simple');
     fs.rmSync(home, {recursive: true, force: true});
-    fs.mkdirSync(path.resolve(home, 'src'), {recursive: true});
+    fs.mkdirSync(path.resolve(home, 'src/foo/bar'), {recursive: true});
     fs.writeFileSync(
-      path.resolve(home, 'src/simple.eo'),
+      path.resolve(home, 'src/foo/bar/simple.eo'),
       [
         '+package foo.bar',
         '+alias org.eolang.io.stdout',
-        '+alias org.eolang.txt.sprintf',
-        '+alias org.eolang.collections.list',
         '',
-        '[args...] > app',
-        '  seq > @',
-        '    reduced.',
-        '      list',
-        '        * 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10',
-        '      TRUE',
-        '      [a x]',
-        '        TRUE > @',
-        '    stdout',
-        '      sprintf "Hello, %s!" (args.at 0)',
+        '[args] > simple',
+        '  stdout "Hello, world!\\n" > @',
       ].join('\n')
     );
     const stdout = runSync([
-      'dataize', 'foo.bar.app', 'Jeff',
+      'dataize', 'foo.bar.simple',
       '--verbose',
       '--stack=64M',
       '--clean',
@@ -62,7 +52,7 @@ describe('dataize', function() {
       '-s', path.resolve(home, 'src'),
       '-t', path.resolve(home, 'target'),
     ]);
-    assert(stdout.includes('Hello, Jeff!'), stdout);
+    assert(stdout.includes('Hello, world!'), stdout);
     assert(stdout.includes(`The directory ${path.resolve(home, 'target')} deleted`), stdout);
     assert(!fs.existsSync(path.resolve('../../mvnw/target')));
     done();