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From Shawn Heisey <apa...@elyograg.org>
Subject Odd problem starting program with log4j2 on Windows
Date Tue, 03 Jul 2018 15:10:03 GMT
I'm investigating a problem a user is having with starting the latest
release of Solr on Windows.  This release is the first one we've made
after upgrading log4j from 1.2.x to 2.11.0.

I have double-checked that the script starts the program with this
commandline option:

-Dlog4j.configurationFile="file:C:\Users\sheisey\Downloads\solr-7.4.0\server\scripts\cloud-scripts\log4j2.xml"

This is what's actually in the .cmd file ... I used the 'echo' command
to verify what the full commandline expands to:

-Dlog4j.configurationFile="file:%DEFAULT_SERVER_DIR%\scripts\cloud-scripts\log4j2.xml"

An exception is sent to stdout, which I will provide at the end of this
message.

In the exception, you may notice that the path it says it can't find has
TWO "file:" elements in it, and two paths complete with "C:\" in them. 
The value of DEFAULT_SERVER_DIR is
C:\Users\sheisey\Downloads\solr-7.4.0\server ... which is what's before
the second "file:" in the exception, with the backslashes converted to
forward slashes.  Unless something is going very wrong with the windows
command script language so that the commandline isn't actually what I've
double-checked it to be, it looks like a problem in log4j ... one that
might only exist on Windows.

I'm running this on Windows 7 enterprise edition, the user on the Solr
mailing list is running it on Windows 10 enterprise edition and running
into the same problem.

If I remove the "file:" prefix from the value assigned to the system
property, so that it is a bare Windows path, everything works properly. 
This workaround was mentioned by the user on the Solr mailing list.

The same thing on Linux appears to work correctly.  This is the
commandline option that ends up being used there:

-Dlog4j.configurationFile=file:/index/src/solr-7.4.0/server/scripts/cloud-scripts/log4j2.xml

Here's the exception that I get on Windows:

ERROR StatusLogger Unable to access
file:/C:/Users/sheisey/Downloads/solr-7.4.0/server/file:C:/Users/sheisey/Downloads/solr-7.4.0/server/scripts/cloud-scripts/log4j2.xml
java.io.FileNotFoundException:
C:\Users\sheisey\Downloads\solr-7.4.0\server\file:C:\Users\sheisey\Downloads\solr-7.4.0\server\scripts\cloud-scripts\log4j2.xml
(The filename, directory name, or volume label syntax is incorrect)
        at java.io.FileInputStream.open0(Native Method)
        at java.io.FileInputStream.open(FileInputStream.java:195)
        at java.io.FileInputStream.<init>(FileInputStream.java:138)
        at java.io.FileInputStream.<init>(FileInputStream.java:93)
        at
sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:90)
        at
sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:188)
        at java.net.URL.openStream(URL.java:1045)
        at
org.apache.logging.log4j.core.config.ConfigurationSource.fromUri(ConfigurationSource.java:247)
        at
org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:404)
        at
org.apache.logging.log4j.core.config.ConfigurationFactory$Factory.getConfiguration(ConfigurationFactory.java:346)
        at
org.apache.logging.log4j.core.config.ConfigurationFactory.getConfiguration(ConfigurationFactory.java:260)
        at
org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:615)
        at
org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:636)
        at
org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:231)
        at
org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:153)
        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.spi.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:121)
        at
org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:43)
        at
org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:46)
        at
org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:29)
        at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:358)
        at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:383)
        at org.apache.solr.util.SolrCLI.<clinit>(SolrCLI.java:228)

Is there any other information I can provide?  You can download Solr at
http://lucene.apache.org/solr if you need to reproduce and investigate
the scripting that comes with it.

Thanks,
Shawn


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