Remote debugging: No connection to Wildfly 14 on OpenJDK 11 at port 8787

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1
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I'm trying to connect my debugger to Wildlfy running on Open JDK 11.

Despite Wildfly says:

Listening for transport dt_socket at address: 8787

My IDE (IntelliJ IDEA CE 2018.1) claims that it doesn't get any connection:

Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed".

I'm starting Wildfly via standalone.sh --debug resulting in the following JAVA_OPTS:

-server

-Xms64m

-Xmx512m

-XX:MetaspaceSize=96M

-XX:MaxMetaspaceSize=256m

-Djava.net.preferIPv4Stack=true

-Djboss.modules.system.pkgs=org.jboss.byteman

-Djava.awt.headless=true

-agentlib:jdwp=transport=dt_socket,address=8787,server=y,suspend=n

--add-exports=java.base/sun.nio.ch=ALL-UNNAMED

--add-exports=jdk.unsupported/sun.misc=ALL-UNNAMED

--add-exports=jdk.unsupported/sun.reflect=ALL-UNNAMED

--add-modules=java.se

Did something change in Java 9/10/11? Remote debugging with the exact same setup works fine when using Oracle JDK 8.

Using telnet I can confirm, that port 8787 is indeed not reachable.

Update after reading @ehsavoie's comment: netstat -ln on the server running Wildfly shows:

Proto Recv-Q Send-Q Local Address           Foreign Address         State   

tcp        0      0 127.0.0.1:8787          0.0.0.0:*               LISTEN

So apparently with OpenJDK 11 the debug port is now bound to localhost by default.

edited yesterday

Mikhail Kholodkov

3,49342141

asked Nov 7 at 22:24

Sebastian S

2,05511535

Few doubts in general - Does that work on any other port by the way? What is the content of standalone.sh? How about tracing any failure logs for this?
– nullpointer
Nov 8 at 3:17

standalone.sh is the unpatched file from Wildfly 14.0.1. Like what other ports? Wildfly is reachable via 8080, 8443 and 9990. 8787 is clearly exposed as debug port in the aforementioned JAVA_OPTS.
– Sebastian S
Nov 8 at 7:39

1

and if you set suspend to yes (y) does the startup suspend ? Just checking that the debug option is taken into account by the JVM
– ehsavoie
Nov 8 at 8:04

@ehsavoie indeed Wildfly suspends after logging Listening for transport dt_socket at address: 8787. However my IDE (IntelliJ Idea) still says Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed"
– Sebastian S
Nov 8 at 9:00

1

What does netstat -ln show ?
– ehsavoie
Nov 8 at 14:32

|
show 1 more comment

up vote
1
down vote

favorite

I'm trying to connect my debugger to Wildlfy running on Open JDK 11.

Despite Wildfly says:

Listening for transport dt_socket at address: 8787

My IDE (IntelliJ IDEA CE 2018.1) claims that it doesn't get any connection:

Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed".

I'm starting Wildfly via standalone.sh --debug resulting in the following JAVA_OPTS:

-server

-Xms64m

-Xmx512m

-XX:MetaspaceSize=96M

-XX:MaxMetaspaceSize=256m

-Djava.net.preferIPv4Stack=true

-Djboss.modules.system.pkgs=org.jboss.byteman

-Djava.awt.headless=true

-agentlib:jdwp=transport=dt_socket,address=8787,server=y,suspend=n

--add-exports=java.base/sun.nio.ch=ALL-UNNAMED

--add-exports=jdk.unsupported/sun.misc=ALL-UNNAMED

--add-exports=jdk.unsupported/sun.reflect=ALL-UNNAMED

--add-modules=java.se

Did something change in Java 9/10/11? Remote debugging with the exact same setup works fine when using Oracle JDK 8.

Using telnet I can confirm, that port 8787 is indeed not reachable.

Update after reading @ehsavoie's comment: netstat -ln on the server running Wildfly shows:

Proto Recv-Q Send-Q Local Address           Foreign Address         State   

tcp        0      0 127.0.0.1:8787          0.0.0.0:*               LISTEN

So apparently with OpenJDK 11 the debug port is now bound to localhost by default.

edited yesterday

Mikhail Kholodkov

3,49342141

asked Nov 7 at 22:24

Sebastian S

2,05511535

Few doubts in general - Does that work on any other port by the way? What is the content of standalone.sh? How about tracing any failure logs for this?
– nullpointer
Nov 8 at 3:17

standalone.sh is the unpatched file from Wildfly 14.0.1. Like what other ports? Wildfly is reachable via 8080, 8443 and 9990. 8787 is clearly exposed as debug port in the aforementioned JAVA_OPTS.
– Sebastian S
Nov 8 at 7:39

1

and if you set suspend to yes (y) does the startup suspend ? Just checking that the debug option is taken into account by the JVM
– ehsavoie
Nov 8 at 8:04

@ehsavoie indeed Wildfly suspends after logging Listening for transport dt_socket at address: 8787. However my IDE (IntelliJ Idea) still says Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed"
– Sebastian S
Nov 8 at 9:00

1

What does netstat -ln show ?
– ehsavoie
Nov 8 at 14:32

|
show 1 more comment

up vote
1
down vote

favorite

I'm trying to connect my debugger to Wildlfy running on Open JDK 11.

Despite Wildfly says:

Listening for transport dt_socket at address: 8787

My IDE (IntelliJ IDEA CE 2018.1) claims that it doesn't get any connection:

Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed".

I'm starting Wildfly via standalone.sh --debug resulting in the following JAVA_OPTS:

-server

-Xms64m

-Xmx512m

-XX:MetaspaceSize=96M

-XX:MaxMetaspaceSize=256m

-Djava.net.preferIPv4Stack=true

-Djboss.modules.system.pkgs=org.jboss.byteman

-Djava.awt.headless=true

-agentlib:jdwp=transport=dt_socket,address=8787,server=y,suspend=n

--add-exports=java.base/sun.nio.ch=ALL-UNNAMED

--add-exports=jdk.unsupported/sun.misc=ALL-UNNAMED

--add-exports=jdk.unsupported/sun.reflect=ALL-UNNAMED

--add-modules=java.se

Did something change in Java 9/10/11? Remote debugging with the exact same setup works fine when using Oracle JDK 8.

Using telnet I can confirm, that port 8787 is indeed not reachable.

Update after reading @ehsavoie's comment: netstat -ln on the server running Wildfly shows:

Proto Recv-Q Send-Q Local Address           Foreign Address         State   

tcp        0      0 127.0.0.1:8787          0.0.0.0:*               LISTEN

So apparently with OpenJDK 11 the debug port is now bound to localhost by default.

edited yesterday

Mikhail Kholodkov

3,49342141

asked Nov 7 at 22:24

Sebastian S

2,05511535

I'm trying to connect my debugger to Wildlfy running on Open JDK 11.

Despite Wildfly says:

Listening for transport dt_socket at address: 8787

My IDE (IntelliJ IDEA CE 2018.1) claims that it doesn't get any connection:

Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed".

I'm starting Wildfly via standalone.sh --debug resulting in the following JAVA_OPTS:

-server

-Xms64m

-Xmx512m

-XX:MetaspaceSize=96M

-XX:MaxMetaspaceSize=256m

-Djava.net.preferIPv4Stack=true

-Djboss.modules.system.pkgs=org.jboss.byteman

-Djava.awt.headless=true

-agentlib:jdwp=transport=dt_socket,address=8787,server=y,suspend=n

--add-exports=java.base/sun.nio.ch=ALL-UNNAMED

--add-exports=jdk.unsupported/sun.misc=ALL-UNNAMED

--add-exports=jdk.unsupported/sun.reflect=ALL-UNNAMED

--add-modules=java.se

Did something change in Java 9/10/11? Remote debugging with the exact same setup works fine when using Oracle JDK 8.

Using telnet I can confirm, that port 8787 is indeed not reachable.

Update after reading @ehsavoie's comment: netstat -ln on the server running Wildfly shows:

Proto Recv-Q Send-Q Local Address           Foreign Address         State   

tcp        0      0 127.0.0.1:8787          0.0.0.0:*               LISTEN

So apparently with OpenJDK 11 the debug port is now bound to localhost by default.

java debugging wildfly remote-debugging java-11

edited yesterday

Mikhail Kholodkov

3,49342141

asked Nov 7 at 22:24

Sebastian S

2,05511535

edited yesterday

Mikhail Kholodkov

3,49342141

asked Nov 7 at 22:24

Sebastian S

2,05511535

edited yesterday

Mikhail Kholodkov

3,49342141

edited yesterday

Mikhail Kholodkov

3,49342141

edited yesterday

Mikhail Kholodkov

3,49342141

asked Nov 7 at 22:24

Sebastian S

2,05511535

asked Nov 7 at 22:24

Sebastian S

2,05511535

asked Nov 7 at 22:24

Sebastian S

2,05511535

Few doubts in general - Does that work on any other port by the way? What is the content of standalone.sh? How about tracing any failure logs for this?
– nullpointer
Nov 8 at 3:17

standalone.sh is the unpatched file from Wildfly 14.0.1. Like what other ports? Wildfly is reachable via 8080, 8443 and 9990. 8787 is clearly exposed as debug port in the aforementioned JAVA_OPTS.
– Sebastian S
Nov 8 at 7:39

1

and if you set suspend to yes (y) does the startup suspend ? Just checking that the debug option is taken into account by the JVM
– ehsavoie
Nov 8 at 8:04

@ehsavoie indeed Wildfly suspends after logging Listening for transport dt_socket at address: 8787. However my IDE (IntelliJ Idea) still says Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed"
– Sebastian S
Nov 8 at 9:00

1

What does netstat -ln show ?
– ehsavoie
Nov 8 at 14:32

|
show 1 more comment

Few doubts in general - Does that work on any other port by the way? What is the content of standalone.sh? How about tracing any failure logs for this?
– nullpointer
Nov 8 at 3:17

standalone.sh is the unpatched file from Wildfly 14.0.1. Like what other ports? Wildfly is reachable via 8080, 8443 and 9990. 8787 is clearly exposed as debug port in the aforementioned JAVA_OPTS.
– Sebastian S
Nov 8 at 7:39

1

and if you set suspend to yes (y) does the startup suspend ? Just checking that the debug option is taken into account by the JVM
– ehsavoie
Nov 8 at 8:04

@ehsavoie indeed Wildfly suspends after logging Listening for transport dt_socket at address: 8787. However my IDE (IntelliJ Idea) still says Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed"
– Sebastian S
Nov 8 at 9:00

1

What does netstat -ln show ?
– ehsavoie
Nov 8 at 14:32

Few doubts in general - Does that work on any other port by the way? What is the content of standalone.sh? How about tracing any failure logs for this?
– nullpointer
Nov 8 at 3:17

standalone.sh is the unpatched file from Wildfly 14.0.1. Like what other ports? Wildfly is reachable via 8080, 8443 and 9990. 8787 is clearly exposed as debug port in the aforementioned JAVA_OPTS.
– Sebastian S
Nov 8 at 7:39

and if you set suspend to yes (y) does the startup suspend ? Just checking that the debug option is taken into account by the JVM
– ehsavoie
Nov 8 at 8:04

@ehsavoie indeed Wildfly suspends after logging Listening for transport dt_socket at address: 8787. However my IDE (IntelliJ Idea) still says Unable to open debugger port (localhost:8787): java.io.IOException "handshake failed - connection prematurally closed"
– Sebastian S
Nov 8 at 9:00

What does netstat -ln show ?
– ehsavoie
Nov 8 at 14:32

|
show 1 more comment

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