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Logging in JDK11 HttpClient

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1

1

JDK11 introduced a new HTTP Client, with many features that lacks in traditional java.net.HttpURLConnection class. First question that I encountered with is how to properly enable logging in newly added HTTP Client?

java http logging java-11 java-http-client

share|improve this question

edited Feb 17 at 14:28

Krzysztof Krasoń

16.7k1010 gold badges6363 silver badges8787 bronze badges

asked Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

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• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See stackoverflow.com/questions/53215038/…
  
  – daniel
  Feb 18 at 14:49
  

  
  
  
  

add a comment | 

1

1

JDK11 introduced a new HTTP Client, with many features that lacks in traditional java.net.HttpURLConnection class. First question that I encountered with is how to properly enable logging in newly added HTTP Client?

java http logging java-11 java-http-client

share|improve this question

edited Feb 17 at 14:28

Krzysztof Krasoń

16.7k1010 gold badges6363 silver badges8787 bronze badges

asked Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  See stackoverflow.com/questions/53215038/…
  
  – daniel
  Feb 18 at 14:49
  

  
  
  
  

add a comment | 

JDK11 introduced a new HTTP Client, with many features that lacks in traditional java.net.HttpURLConnection class. First question that I encountered with is how to properly enable logging in newly added HTTP Client?

java http logging java-11 java-http-client

share|improve this question

edited Feb 17 at 14:28

Krzysztof Krasoń

16.7k1010 gold badges6363 silver badges8787 bronze badges

asked Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

share|improve this question

edited Feb 17 at 14:28

Krzysztof Krasoń

16.7k1010 gold badges6363 silver badges8787 bronze badges

asked Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

share|improve this question

edited Feb 17 at 14:28

Krzysztof Krasoń

16.7k1010 gold badges6363 silver badges8787 bronze badges

asked Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

edited Feb 17 at 14:28

Krzysztof Krasoń

16.7k1010 gold badges6363 silver badges8787 bronze badges

edited Feb 17 at 14:28

Krzysztof Krasoń

16.7k1010 gold badges6363 silver badges8787 bronze badges

asked Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

asked Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

1 Answer
1

active

oldest

votes

2

The client uses java.util.logging, the easiest way is to use SLF4J.
See JUL to SLF4J Bridge for more information.

3 steps are required:

1. 
   

   Add jul-to-slf4j brifge to you classpath with runtime scope.
   Maven:

   
   
   

   <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>jul-to-slf4j</artifactId>
    <version>1.7.25</version>
    <scope>runtime</scope>
   </dependency>
   

   
   
   

   Gradle:

   
   
   

   runtime group: 'org.slf4j', name: 'jul-to-slf4j', version: '1.7.25'

   
   


2. 
   

   Add in logback.xml (logback-test.xml), don't forget to add a STDOUT appender (or change it accordingly)

   
   
   

   <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator">
    <resetJUL>true</resetJUL>
   </contextListener>
   
   <logger name="jdk.internal.httpclient.debug" level="debug" additivity="false">
    <appender-ref ref="STDOUT" />
   </logger>
   
   <root level="DEBUG">
    <appender-ref ref="STDOUT"/>
   </root>
   

   
   


3. 
   

   Add in your code:

   
   
   

    static 
    SLF4JBridgeHandler.removeHandlersForRootLogger();
    SLF4JBridgeHandler.install();
    
   

   
   

Alternatively, for educational purposes it is possible to add a system property:
-Djdk.httpclient.HttpClient.log=all
which will enable all logging printing to the console.

share|improve this answer

edited Mar 25 at 12:29

answered Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

add a comment | 

Your Answer

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2

The client uses java.util.logging, the easiest way is to use SLF4J.
See JUL to SLF4J Bridge for more information.

3 steps are required:

1. 
   

   Add jul-to-slf4j brifge to you classpath with runtime scope.
   Maven:

   
   
   

   <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>jul-to-slf4j</artifactId>
    <version>1.7.25</version>
    <scope>runtime</scope>
   </dependency>
   

   
   
   

   Gradle:

   
   
   

   runtime group: 'org.slf4j', name: 'jul-to-slf4j', version: '1.7.25'

   
   


2. 
   

   Add in logback.xml (logback-test.xml), don't forget to add a STDOUT appender (or change it accordingly)

   
   
   

   <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator">
    <resetJUL>true</resetJUL>
   </contextListener>
   
   <logger name="jdk.internal.httpclient.debug" level="debug" additivity="false">
    <appender-ref ref="STDOUT" />
   </logger>
   
   <root level="DEBUG">
    <appender-ref ref="STDOUT"/>
   </root>
   

   
   


3. 
   

   Add in your code:

   
   
   

    static 
    SLF4JBridgeHandler.removeHandlersForRootLogger();
    SLF4JBridgeHandler.install();
    
   

   
   

Alternatively, for educational purposes it is possible to add a system property:
-Djdk.httpclient.HttpClient.log=all
which will enable all logging printing to the console.

share|improve this answer

edited Mar 25 at 12:29

answered Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

add a comment | 

2

The client uses java.util.logging, the easiest way is to use SLF4J.
See JUL to SLF4J Bridge for more information.

3 steps are required:

1. 
   

   Add jul-to-slf4j brifge to you classpath with runtime scope.
   Maven:

   
   
   

   <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>jul-to-slf4j</artifactId>
    <version>1.7.25</version>
    <scope>runtime</scope>
   </dependency>
   

   
   
   

   Gradle:

   
   
   

   runtime group: 'org.slf4j', name: 'jul-to-slf4j', version: '1.7.25'

   
   


2. 
   

   Add in logback.xml (logback-test.xml), don't forget to add a STDOUT appender (or change it accordingly)

   
   
   

   <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator">
    <resetJUL>true</resetJUL>
   </contextListener>
   
   <logger name="jdk.internal.httpclient.debug" level="debug" additivity="false">
    <appender-ref ref="STDOUT" />
   </logger>
   
   <root level="DEBUG">
    <appender-ref ref="STDOUT"/>
   </root>
   

   
   


3. 
   

   Add in your code:

   
   
   

    static 
    SLF4JBridgeHandler.removeHandlersForRootLogger();
    SLF4JBridgeHandler.install();
    
   

   
   

Alternatively, for educational purposes it is possible to add a system property:
-Djdk.httpclient.HttpClient.log=all
which will enable all logging printing to the console.

share|improve this answer

edited Mar 25 at 12:29

answered Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

add a comment | 

The client uses java.util.logging, the easiest way is to use SLF4J.
See JUL to SLF4J Bridge for more information.

3 steps are required:

1. 
   

   Add jul-to-slf4j brifge to you classpath with runtime scope.
   Maven:

   
   
   

   <dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>jul-to-slf4j</artifactId>
    <version>1.7.25</version>
    <scope>runtime</scope>
   </dependency>
   

   
   
   

   Gradle:

   
   
   

   runtime group: 'org.slf4j', name: 'jul-to-slf4j', version: '1.7.25'

   
   


2. 
   

   Add in logback.xml (logback-test.xml), don't forget to add a STDOUT appender (or change it accordingly)

   
   
   

   <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator">
    <resetJUL>true</resetJUL>
   </contextListener>
   
   <logger name="jdk.internal.httpclient.debug" level="debug" additivity="false">
    <appender-ref ref="STDOUT" />
   </logger>
   
   <root level="DEBUG">
    <appender-ref ref="STDOUT"/>
   </root>
   

   
   


3. 
   

   Add in your code:

   
   
   

    static 
    SLF4JBridgeHandler.removeHandlersForRootLogger();
    SLF4JBridgeHandler.install();
    
   

   
   

Alternatively, for educational purposes it is possible to add a system property:
-Djdk.httpclient.HttpClient.log=all
which will enable all logging printing to the console.

share|improve this answer

edited Mar 25 at 12:29

answered Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

share|improve this answer

edited Mar 25 at 12:29

answered Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

answered Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges

answered Feb 17 at 7:57

Maxim KirilovMaxim Kirilov

1,3411414 silver badges3030 bronze badges