B4J Question [Solved] How to use SetSystemProperty in debug mode?

[knutf]

I use HttpJob to download map image from WMS-server. The HttpJob reported this error message: java.net.SocketException: Address family not supported by protocol family: connect. I found that it could be Java that tries to use IPv6 addressing against a server that use IPv4 addressing, and that it could help setting the system property “java.net.preferIPv4Stack” to true. I added the following line:

SetSystemProperty("java.net.preferIPv4Stack" , "true")

in the AppStart Sub.

It works in Release mode, but not in debug mode.

How can i set the system property java.net.preferIPv4Stack so it works in debug mode?

I use jdk1.8.0_231

Example project attached. Running in Debug causes the error, but running in Release do not.

 

[stevel05]

Works here for me in Java 11 and Java 8.0_192

    Log(GetSystemProperty("java.net.preferIPv4Stack","NF"))
    SetSystemProperty("java.net.preferIPv4Stack" , "true")
    Log(GetSystemProperty("java.net.preferIPv4Stack","NF"))

Gives:

Waiting for debugger to connect...
Program started.
NF
true

But I can see the map if I comment the line out too.

There are some more suggestions here: https://stackoverflow.com/questions...protocol-family-socketexception-on-a-specific

 

[Erel]

My guess is that this error is not related to IPv6 vs. IPv4.

 

[knutf]

My guess is that this error is not related to IPv6 vs. IPv4.

You have right, it was the adware PremierOpinion that caused the error. After uninstalling the adware HttpJob works as expected.

There are some more suggestions here: https://stackoverflow.com/questions...protocol-family-socketexception-on-a-specific

Your link lead me to the right solution.

Thank you