在GAE项目上进行调试时，Eclipse Oxygen会非常缓慢地启动服务器。 服务器进程挂起处于停止挂起状态

Question

I have a Maven Java GAE (Google App Engine) project in Eclipse Oxygen Release 4.7.2 and Google Cloud Tools for Eclipse plugin version 1.5.0. I'm running my Eclipse in a Windows 10 machine.

I have simple a Servlet class in my code:

package it.ale.test;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "HelloAppEngine", urlPatterns = { "/hello" }, loadOnStartup = 1)
public class HelloAppEngine extends HttpServlet {

    @Override
    public void init() throws ServletException {

        super.init();

        System.out.println("Print something.");

    }

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {

        response.setContentType("text/plain");
        response.setCharacterEncoding("UTF-8");

        response.getWriter().print("Hello App Engine!\r\n");

    }

}

when I put a debug breakpoint on any line of the "public void init()" function, example on the line:

System.out.println("Print something.");

and I start the server in DEBUG mode (Debug As -> App Engine) , the server startup is incredible SLOW and I reach the error message:

server app engine Standard at localhost was unable to start within 240 seconds. If the server requires more time, try increasing the timeout in the server editor.

---

UPDATE 16 January 2018:

in the meantime while the mistake is coming, Eclipse freeze and after that the Java process of the launched server remains hanging. So I cannot restart the server unless I kill the Java server process.

This is a screenshot that represents this point

Note that in the lower right corner the server's Java process has not yet been stopped

This is a screenshot that show the pending stopping state

So I cannot restart the server unless I kill the Java server process.

@BriandeAlwis Is there any log I can provide to help you better? Maybe is a Google Cloud SDK "gcloud" integration problem ?

---

UPDATE 16 January 2018:

I try to downgrade version in Google Cloud SDK:

• Google Cloud SDK 172.0.0
• app-engine-java 1.9.56
• app-engine-python 1.9.60
• bq 2.0.26
• core 2017.09.15
• gsutil 4.27

but the problem persists.

Now I'm back to the most current version highlighting the problem again.

• Google Cloud SDK 184.0.0
• app-engine-java 1.9.60
• app-engine-python 1.9.65
• bq 2.0.28
• core 2018.01.15
• gsutil 4.28

Answer 1

This has been fixed since Google Cloud Tools for Eclipse 1.6.0.

For those who are interested in the details, see https://github.com/GoogleCloudPlatform/google-cloud-eclipse/issues/2727 .

Answer 2

You can fix this issue by deleting your existing server and removing your all break points and restart again your project in app engine

Window->Show View->other->Servers(search for servers if doesn't exists) Window->Show View->other->Breakpoints(search for breakpoints if doesn't exists)

after that simply right click on servers and delete them refresh your work-space and run project it will work. Happy Coding.

Answer 3

I updated the plugin to version 1.5.1 and finally I saw that the problem of slow startup, both in DEBUG and in RUN has been solved.

In any case I found that the following problem persists:

In the meantime I discovered another bug ... try replacing the code of the INIT function with this code:

 @Override public void init() throws ServletException { super.init(); if (true) { throw new RuntimeException(); } System.out.println("Print something."); } 

in this way I force an exception to the start. Try to click on Run As -> App Engine and try to stop the server . The server remains hung in " STOPPING " state.

This means that if there is an exception in the startup code the server will not shut down anymore.