They can always be passed via `-D` on the command line.

Examples of properties that follow the naming rules:

* `org.gradle.internal.operations.trace`
* `org.gradle.internal.cmdline.max.length`
* …

### Properties of pre-incubation features

Properties of pre-incubation features MUST start with `org.gradle.experimental.`  
They can all be called **experimental properties**.

        List<String> cmdList = Arrays.asList("echo", "hello");
        Consumer<ProcessBuilder> pbCall = pb -> {
            pb.redirectErrorStream(true);
        };

        try {
            // Start multiple processes
            processHelper.startProcess(sessionId1, cmdList, pbCall);
            processHelper.startProcess(sessionId2, cmdList, pbCall);

            }
            cmdList.add(buf.toString());
        } else if (defaultValue != null) {
            cmdList.add("-D" + name + "=" + defaultValue);
        }
    }

    /**
     * Adds all Fess configuration properties to the command list.
     * Properties starting with the Fess config prefix are included.
     *
     * @param cmdList the command list to add properties to
     */

            jvmOptions.stream().filter(StringUtil::isNotBlank).forEach(cmdList::add);
        }

        cmdList.add(ThumbnailGenerator.class.getCanonicalName());

        cmdList.add("--sessionId");
        cmdList.add(sessionId);
        cmdList.add("--numOfThreads");
        cmdList.add(Integer.toString(numOfThreads));
        if (cleanup) {
            cmdList.add("--cleanup");
        }

        }

        cmdList.add(SuggestCreator.class.getCanonicalName());

        cmdList.add("--sessionId");
        cmdList.add(sessionId);

        final File propFile = ComponentUtil.getSystemHelper().createTempFile(getExecuteType() + "_", ".properties");
        try {
            cmdList.add("-p");
            cmdList.add(propFile.getAbsolutePath());

                final String tempPath = tempFile.getAbsolutePath();
                final String outputPath = outputFile.getAbsolutePath();
                final List<String> cmdList = new ArrayList<>();
                for (final String value : commandList) {
                    cmdList.add(expandPath(value.replace("${url}", tempPath)
                            .replace("${outputFile}", outputPath)

        assertTrue(cmdList.contains("-Dcustom.prop.one=value1"));
        assertTrue(cmdList.contains("-Dcustom.prop.two=value2"));

        // Test with null regex
        cmdList.clear();
        execJob.testAddFessCustomSystemProperties(cmdList, null);
        assertEquals(0, cmdList.size());

        // Test with empty regex
        cmdList.clear();
        execJob.testAddFessCustomSystemProperties(cmdList, "");

        cmdList.add(sessionId);
        cmdList.add("--name");
        cmdList.add(namespace);

        if (webConfigIds != null && webConfigIds.length > 0) {
            cmdList.add("-w");
            cmdList.add(StringUtils.join(webConfigIds, ','));
        }
        if (fileConfigIds != null && fileConfigIds.length > 0) {
            cmdList.add("-f");

        } finally {
            System.clearProperty("os.name");
        }

        List<String> cmdList = mockProcessHelper.getLastCommandList();
        if (cmdList != null && cmdList.size() > 0) {
            assertTrue(cmdList.contains("-cp") || cmdList.contains("-classpath"));
        }
    }

    // Test executeSuggestCreator with Unix environment
    @Test

     * @param cmdList list of command and arguments to execute
     * @param pbCall callback to configure the ProcessBuilder
     * @return JobProcess representing the started process
     */
    public JobProcess startProcess(final String sessionId, final List<String> cmdList, final Consumer<ProcessBuilder> pbCall) {
        return startProcess(sessionId, cmdList, pbCall, InputStreamThread.MAX_BUFFER_SIZE, null);
    }