[jira] [Commented] (LOG4J2-2650) ArrayIndexOutOfBoundsException in the initialization of UuidUtil

2019-07-04 Thread Mattia Bertorello (JIRA) 


[ 
https://issues.apache.org/jira/browse/LOG4J2-2650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16878536#comment-16878536
 ] 

Mattia Bertorello commented on LOG4J2-2650:
---

Done [https://github.com/apache/logging-log4j2/pull/290] :) 

> ArrayIndexOutOfBoundsException in the initialization of UuidUtil
> 
>
> Key: LOG4J2-2650
> URL: https://issues.apache.org/jira/browse/LOG4J2-2650
> Project: Log4j 2
>  Issue Type: Bug
>  Components: Core
>Affects Versions: 2.12.0
> Environment: os : Mac OS
> java: 1.8 (jdk1.8.0_172.jdk)
> none network interfaces connected
>Reporter: Mattia Bertorello
>Priority: Major
>  Time Spent: 10m
>  Remaining Estimate: 0h
>
> Hi, 
> I found a problem in the UuidUtil initialization.
> The code that generate the exception
> {code:java}
>   private static Logger log = LogManager.getLogger(MyClass.class);
> {code}
> This code return a ip address of localhost and when the stack is IPv4 return 
> 4 bytes but when the default stack is IPv6 it's going to return 16 bytes.
>   
> [NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
> {code:java}
> if (mac == null || mac.length == 0) { 
>mac = localHost.getAddress(); 
> }
> {code}
> This is the part that generate the ArrayIndexOutOfBoundsException
>  
> [UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]
> {code:java}
> System.arraycopy(mac, index, node, index + 2, length);{code}
> These 16 bytes will generate a wrong destination index that exceed the length 
> of the node array.
> {noformat}
> mac = {byte[16]@3217} 
> length = 6 
> index = 10 
> node = {byte[8]@3222}
> {noformat}
> This is the complete exception  
> {code}
> java.lang.ExceptionInInitializerError at 
> org.apache.logging.log4j.core.util.WatchManager.(WatchManager.java:53) 
> at 
> org.apache.logging.log4j.core.config.AbstractConfiguration.(AbstractConfiguration.java:135)
>  at 
> org.apache.logging.log4j.core.config.NullConfiguration.(NullConfiguration.java:32)
>  at 
> org.apache.logging.log4j.core.LoggerContext.(LoggerContext.java:79) 
> at 
> org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.createContext(ClassLoaderContextSelector.java:171)
>  at 
> org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:145)
>  at 
> org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:70)
>  at 
> org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:57)
>  at 
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:148)
>  at 
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
>  at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194) at 
> org.apache.logging.log4j.LogManager.getLogger(LogManager.java:581) at 
> cc.arduino.contributions.packages.ContributionInstaller.(ContributionInstaller.java:66)
>  at processing.app.Base.(Base.java:291) at 
> processing.app.Base.main(Base.java:150) Caused by: 
> java.lang.ArrayIndexOutOfBoundsException at java.lang.System.arraycopy(Native 
> Method) at 
> org.apache.logging.log4j.core.util.UuidUtil.(UuidUtil.java:81) ... 15 
> more
> {code}
> To reproduce the exception you need
>  * disconnect every network interface
>  * verify that java will use the IPv6 stack -Djava.net.preferIPv4Stack=false 
> -Djava.net.preferIPv6Addresses=true
>  * Initialize a log of log4j
> I suggest different solution:
>  - Remove  
> [NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
>  and return always null (when the other code fail to init the mac variable ) 
> because in general the method is called getMacAddress but in that particular 
> case will return and IP address 
>  - Mange the IPv6 case in the static part of the class UuidUtil 
> [UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]



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[jira] [Updated] (LOG4J2-2650) ArrayIndexOutOfBoundsException in the initialization of UuidUtil

2019-07-02 Thread Mattia Bertorello (JIRA) 


 [ 
https://issues.apache.org/jira/browse/LOG4J2-2650?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Mattia Bertorello updated LOG4J2-2650:
--
Description: 
Hi, 

I found a problem in the UuidUtil initialization.

The code that generate the exception
{code:java}
  private static Logger log = LogManager.getLogger(MyClass.class);
{code}
This code return a ip address of localhost and when the stack is IPv4 return 4 
bytes but when the default stack is IPv6 it's going to return 16 bytes.
  
[NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
{code:java}
if (mac == null || mac.length == 0) { 
   mac = localHost.getAddress(); 
}
{code}
This is the part that generate the ArrayIndexOutOfBoundsException

 
[UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]
{code:java}
System.arraycopy(mac, index, node, index + 2, length);{code}
These 16 bytes will generate a wrong destination index that exceed the length 
of the node array.
{noformat}
mac = {byte[16]@3217} 
length = 6 
index = 10 
node = {byte[8]@3222}
{noformat}
This is the complete exception  

{code}
java.lang.ExceptionInInitializerError at 
org.apache.logging.log4j.core.util.WatchManager.(WatchManager.java:53) at 
org.apache.logging.log4j.core.config.AbstractConfiguration.(AbstractConfiguration.java:135)
 at 
org.apache.logging.log4j.core.config.NullConfiguration.(NullConfiguration.java:32)
 at org.apache.logging.log4j.core.LoggerContext.(LoggerContext.java:79) 
at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.createContext(ClassLoaderContextSelector.java:171)
 at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:145)
 at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:70)
 at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:57)
 at 
org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:148)
 at 
org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
 at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194) at 
org.apache.logging.log4j.LogManager.getLogger(LogManager.java:581) at 
cc.arduino.contributions.packages.ContributionInstaller.(ContributionInstaller.java:66)
 at processing.app.Base.(Base.java:291) at 
processing.app.Base.main(Base.java:150) Caused by: 
java.lang.ArrayIndexOutOfBoundsException at java.lang.System.arraycopy(Native 
Method) at 
org.apache.logging.log4j.core.util.UuidUtil.(UuidUtil.java:81) ... 15 
more
{code}

To reproduce the exception you need
 * disconnect every network interface
 * verify that java will use the IPv6 stack -Djava.net.preferIPv4Stack=false 
-Djava.net.preferIPv6Addresses=true
 * Initialize a log of log4j

I suggest different solution:
 - Remove  
[NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
 and return always null (when the other code fail to init the mac variable ) 
because in general the method is called getMacAddress but in that particular 
case will return and IP address 
 - Mange the IPv6 case in the static part of the class UuidUtil 
[UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]

  was:
Hi, 

I found a problem in the UuidUtil initialization.

The code that generate the exception
{code:java}
  private static Logger log = LogManager.getLogger(MyClass.class);
{code}
This code return a ip address of localhost and when the stack is IPv4 return 4 
bytes but when the default stack is IPv6 it's going to return 16 bytes.
  
[NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
{code:java}
if (mac == null || mac.length == 0) { 
   mac = localHost.getAddress(); 
}
{code}
This is the part that generate the ArrayIndexOutOfBoundsException

 
[UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]
{code:java}
System.arraycopy(mac, index, node, index + 2, length);{code}
These 16 bytes will generate a wrong destination index that exceed the length 
of the node array.
{noformat}
mac = {byte[16]@3217} 
length = 6 
index = 10 
node = {byte[8]@3222}
{noformat}
This is the

[jira] [Updated] (LOG4J2-2650) ArrayIndexOutOfBoundsException in the initialization of UuidUtil

2019-07-02 Thread Mattia Bertorello (JIRA) 


 [ 
https://issues.apache.org/jira/browse/LOG4J2-2650?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Mattia Bertorello updated LOG4J2-2650:
--
Description: 
Hi, 

I found a problem in the UuidUtil initialization.

The code that generate the exception
{code:java}
  private static Logger log = LogManager.getLogger(MyClass.class);
{code}
This code return a ip address of localhost and when the stack is IPv4 return 4 
bytes but when the default stack is IPv6 it's going to return 16 bytes.
  
[NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
{code:java}
if (mac == null || mac.length == 0) { 
   mac = localHost.getAddress(); 
}
{code}
This is the part that generate the ArrayIndexOutOfBoundsException

 
[UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]
{code:java}
System.arraycopy(mac, index, node, index + 2, length);{code}
These 16 bytes will generate a wrong destination index that exceed the length 
of the node array.
{noformat}
mac = {byte[16]@3217} 
length = 6 
index = 10 
node = {byte[8]@3222}
{noformat}
This is the complete exception  

{noformat}
java.lang.ExceptionInInitializerError at 
org.apache.logging.log4j.core.util.WatchManager.(WatchManager.java:53) at 
org.apache.logging.log4j.core.config.AbstractConfiguration.(AbstractConfiguration.java:135)
 at 
org.apache.logging.log4j.core.config.NullConfiguration.(NullConfiguration.java:32)
 at org.apache.logging.log4j.core.LoggerContext.(LoggerContext.java:79) 
at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.createContext(ClassLoaderContextSelector.java:171)
 at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:145)
 at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:70)
 at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:57)
 at 
org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:148)
 at 
org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
 at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194) at 
org.apache.logging.log4j.LogManager.getLogger(LogManager.java:581) at 
cc.arduino.contributions.packages.ContributionInstaller.(ContributionInstaller.java:66)
 at processing.app.Base.(Base.java:291) at 
processing.app.Base.main(Base.java:150) Caused by: 
java.lang.ArrayIndexOutOfBoundsException at java.lang.System.arraycopy(Native 
Method) at 
org.apache.logging.log4j.core.util.UuidUtil.(UuidUtil.java:81) ... 15 
more
{noformat}

To reproduce the exception you need
 * disconnect every network interface
 * verify that java will use the IPv6 stack -Djava.net.preferIPv4Stack=false 
-Djava.net.preferIPv6Addresses=true
 * Initialize a log of log4j

I suggest different solution:
 - Remove  
[NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
 and return always null (when the other code fail to init the mac variable ) 
because in general the method is called getMacAddress but in that particular 
case will return and IP address 
 - Mange the IPv6 case in the static part of the class UuidUtil 
[UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]

  was:
Hi, 

I found a problem in the UuidUtil initialization.

The code that generate the exception
{code:java}
  private static Logger log = LogManager.getLogger(MyClass.class);
{code}
This code return a ip address of localhost and when the stack is IPv4 return 4 
bytes but when the default stack is IPv6 it's going to return 16 bytes.
  
[NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
{code:java}
if (mac == null || mac.length == 0) { 
   mac = localHost.getAddress(); 
}
{code}
This is the part that generate the ArrayIndexOutOfBoundsException

 
[UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]
{code:java}
System.arraycopy(mac, index, node, index + 2, length);{code}
These 16 bytes will generate a wrong destination index that exceed the length 
of the node array.
{noformat}
mac = {byte[16]@3217} 
length = 6 
index = 10 
node = {byte[8]@3222}
{noformat}
This is

[jira] [Updated] (LOG4J2-2650) ArrayIndexOutOfBoundsException in the initialization of UuidUtil

2019-07-02 Thread Mattia Bertorello (JIRA) 


 [ 
https://issues.apache.org/jira/browse/LOG4J2-2650?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Mattia Bertorello updated LOG4J2-2650:
--
Environment: 
os : Mac OS

java: 1.8 (jdk1.8.0_172.jdk)

none network interfaces connected

  was:
os : Mac OS

java: 1.8 (jdk1.8.0_172.jdk)

none network interface connected


> ArrayIndexOutOfBoundsException in the initialization of UuidUtil
> 
>
> Key: LOG4J2-2650
> URL: https://issues.apache.org/jira/browse/LOG4J2-2650
> Project: Log4j 2
>  Issue Type: Bug
>  Components: Core
>Affects Versions: 2.12.0
> Environment: os : Mac OS
> java: 1.8 (jdk1.8.0_172.jdk)
> none network interfaces connected
>Reporter: Mattia Bertorello
>Priority: Major
>
> Hi, 
> I found a problem in the UuidUtil initialization.
> The code that generate the exception
> {code:java}
>   private static Logger log = LogManager.getLogger(MyClass.class);
> {code}
> This code return a ip address of localhost and when the stack is IPv4 return 
> 4 bytes but when the default stack is IPv6 it's going to return 16 bytes.
>   
> [NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
> {code:java}
> if (mac == null || mac.length == 0) { 
>mac = localHost.getAddress(); 
> }
> {code}
> This is the part that generate the ArrayIndexOutOfBoundsException
>  
> [UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]
> {code:java}
> System.arraycopy(mac, index, node, index + 2, length);{code}
> These 16 bytes will generate a wrong destination index that exceed the length 
> of the node array.
> {noformat}
> mac = {byte[16]@3217} 
> length = 6 
> index = 10 
> node = {byte[8]@3222}
> {noformat}
> This is the complete exception  
> {noformat}
> java.lang.ExceptionInInitializerError at 
> org.apache.logging.log4j.core.util.WatchManager.(WatchManager.java:53) 
> at 
> org.apache.logging.log4j.core.config.AbstractConfiguration.(AbstractConfiguration.java:135)
>  at 
> org.apache.logging.log4j.core.config.NullConfiguration.(NullConfiguration.java:32)
>  at 
> org.apache.logging.log4j.core.LoggerContext.(LoggerContext.java:79) 
> at 
> org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.createContext(ClassLoaderContextSelector.java:171)
>  at 
> org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:145)
>  at 
> org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:70)
>  at 
> org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:57)
>  at 
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:148)
>  at 
> org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
>  at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194) at 
> org.apache.logging.log4j.LogManager.getLogger(LogManager.java:581) at 
> cc.arduino.contributions.packages.ContributionInstaller.(ContributionInstaller.java:66)
>  at processing.app.Base.(Base.java:291) at 
> processing.app.Base.main(Base.java:150) Caused by: 
> java.lang.ArrayIndexOutOfBoundsException at java.lang.System.arraycopy(Native 
> Method) at 
> org.apache.logging.log4j.core.util.UuidUtil.(UuidUtil.java:81) ... 15 
> more
> {noformat}
> To reproduce the exception you need
>  * disconnect every network interface
>  * verify that java will use the IPv6 stack -Djava.net.preferIPv4Stack=false 
> -Djava.net.preferIPv6Addresses=true
>  * Initialize a log of log4j
> I suggest different solution:
>  - Remove  
> [NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
>  and return always null (when the other code fail to init the mac variable ) 
> because in general the method is called getMacAddress but in that particular 
> case will return and IP address 
>  - Mange the IPv6 case in the static part of the class UuidUtil 
> [UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]



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[jira] [Created] (LOG4J2-2650) ArrayIndexOutOfBoundsException in the initialization of UuidUtil

2019-07-02 Thread Mattia Bertorello (JIRA) 
Mattia Bertorello created LOG4J2-2650:
-

 Summary: ArrayIndexOutOfBoundsException in the initialization of 
UuidUtil
 Key: LOG4J2-2650
 URL: https://issues.apache.org/jira/browse/LOG4J2-2650
 Project: Log4j 2
  Issue Type: Bug
  Components: Core
Affects Versions: 2.12.0
 Environment: os : Mac OS

java: 1.8 (jdk1.8.0_172.jdk)

none network interface connected
Reporter: Mattia Bertorello


Hi, 

I found a problem in the UuidUtil initialization.

The code that generate the exception
{code:java}
  private static Logger log = LogManager.getLogger(MyClass.class);
{code}
This code return a ip address of localhost and when the stack is IPv4 return 4 
bytes but when the default stack is IPv6 it's going to return 16 bytes.
  
[NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
{code:java}
if (mac == null || mac.length == 0) { 
   mac = localHost.getAddress(); 
}
{code}
This is the part that generate the ArrayIndexOutOfBoundsException

 
[UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]
{code:java}
System.arraycopy(mac, index, node, index + 2, length);{code}
These 16 bytes will generate a wrong destination index that exceed the length 
of the node array.
{noformat}
mac = {byte[16]@3217} 
length = 6 
index = 10 
node = {byte[8]@3222}
{noformat}
This is the complete exception  
{noformat}
java.lang.ExceptionInInitializerError at 
org.apache.logging.log4j.core.util.WatchManager.(WatchManager.java:53) at 
org.apache.logging.log4j.core.config.AbstractConfiguration.(AbstractConfiguration.java:135)
 at 
org.apache.logging.log4j.core.config.NullConfiguration.(NullConfiguration.java:32)
 at org.apache.logging.log4j.core.LoggerContext.(LoggerContext.java:79) 
at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.createContext(ClassLoaderContextSelector.java:171)
 at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.locateContext(ClassLoaderContextSelector.java:145)
 at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:70)
 at 
org.apache.logging.log4j.core.selector.ClassLoaderContextSelector.getContext(ClassLoaderContextSelector.java:57)
 at 
org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:148)
 at 
org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:45)
 at org.apache.logging.log4j.LogManager.getContext(LogManager.java:194) at 
org.apache.logging.log4j.LogManager.getLogger(LogManager.java:581) at 
cc.arduino.contributions.packages.ContributionInstaller.(ContributionInstaller.java:66)
 at processing.app.Base.(Base.java:291) at 
processing.app.Base.main(Base.java:150) Caused by: 
java.lang.ArrayIndexOutOfBoundsException at java.lang.System.arraycopy(Native 
Method) at 
org.apache.logging.log4j.core.util.UuidUtil.(UuidUtil.java:81) ... 15 
more
{noformat}
To reproduce the exception you need
 * disconnect every network interface
 * verify that java will use the IPv6 stack -Djava.net.preferIPv4Stack=false 
-Djava.net.preferIPv6Addresses=true
 * Initialize a log of log4j

I suggest different solution:
 - Remove  
[NetUtils.java#L108|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/NetUtils.java#L108]
 and return always null (when the other code fail to init the mac variable ) 
because in general the method is called getMacAddress but in that particular 
case will return and IP address 
 - Mange the IPv6 case in the static part of the class UuidUtil 
[UuidUtil.java#L81|https://github.com/apache/logging-log4j2/blob/da539329d528d979f4dd385a6ebb639793ef37bd/log4j-core/src/main/java/org/apache/logging/log4j/core/util/UuidUtil.java#L81]



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