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https://issues.apache.org/jira/browse/LOG4J2-1502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15444157#comment-15444157
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Gary Gregory commented on LOG4J2-1502:
--------------------------------------
Might have found something with
org.apache.logging.log4j.core.appender.CsvJsonParameterLayoutFileAppenderTest...
> CsvParameterLayout is inserting NUL character if data starts with {, (, [ or "
> ------------------------------------------------------------------------------
>
> Key: LOG4J2-1502
> URL: https://issues.apache.org/jira/browse/LOG4J2-1502
> Project: Log4j 2
> Issue Type: Bug
> Components: Layouts
> Affects Versions: 2.6.2
> Reporter: Sumit Singhal
>
> I am using CsvParameterLayout to generate a CSV file out of log4j2. One of
> the column is a JSON string. Following is the logger method I am using:
> {code:java}
> logger.info("log:{}",json);
> {code}
> Following is the JSON string:
> {"id":10,"name":"sumit"}
> And following is the string which is getting printed in CSV output file:
> NUL{"id":10,"name":"sumit"}NUL
> The NUL character is the \x00 character. When I open the file in notepad++,
> then only this character appears. In notepad it shows as space. This poses a
> problem in CSV processing module.
> If there is some alphabet before {, then the output in CSV is fine. It seems
> as if log4j is escaping '{' with a NUL character. It is happening if the
> string starts with {, (, [, ' or ".
> Following are the dependencies:
> {code:xml}
> <dependency>
> <groupId>org.apache.logging.log4j</groupId>
> <artifactId>log4j-core</artifactId>
> <version>2.6.2</version>
> </dependency>
> <dependency>
> <groupId>org.apache.logging.log4j</groupId>
> <artifactId>log4j-slf4j-impl</artifactId>
> <version>2.6.2</version>
> </dependency>
> <dependency>
> <groupId>org.apache.commons</groupId>
> <artifactId>commons-csv</artifactId>
> <version>1.4</version>
> </dependency>
> {code}
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