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https://issues.apache.org/jira/browse/LOG4J2-2345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Joseph Husby closed LOG4J2-2345.
--------------------------------
Resolution: Duplicate
> JsonLayout logs malformed if toString() contains empty curly braces {}
> ----------------------------------------------------------------------
>
> Key: LOG4J2-2345
> URL: https://issues.apache.org/jira/browse/LOG4J2-2345
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.11.0
> Reporter: Joseph Husby
> Priority: Major
>
> When using JsonLayout for our appender, an object that has "{}" in its
> toString will result in a recursive output. Here is a simple code example
> and resulting output to illustrate the problem:
> {code:java}
> import org.apache.logging.log4j.LogManager;
> import org.apache.logging.log4j.Logger;
> public class Test {
> public static final Logger log = LogManager.getLogger(Test.class);
> public static void main(final String[] args) {
> log.info("Testing {}", new TestObj());
> }
> static class TestObj {
> @Override
> public String toString() {
> return "This is my toString {} with curly braces";
> }
> }
> }
> {code}
> With this log4j configuration:
> {code:java}
> <Configuration status="INFO">
> <Appenders>
> <Console
> name="Console"
> target="SYSTEM_OUT">
> <JsonLayout
> properties="true"
> complete="true" />
> </Console>
> </Appenders>
> <Loggers>
> <Root level="info">
> <AppenderRef ref="Console" />
> </Root>
> </Loggers>
> </Configuration>
> {code}
> Produces the following output:
> {code:java}
> [
> {
> "thread" : "main",
> "level" : "INFO",
> "loggerName" : "Test",
> "message" : "Testing This is my toString This is my toString {} with curly
> braces with curly braces",
> "endOfBatch" : false,
> "loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
> "instant" : {
> "epochSecond" : 1527636451,
> "nanoOfSecond" : 604000000
> },
> "contextMap" : { },
> "threadId" : 1,
> "threadPriority" : 5
> }
> ]
> {code}
> Note how TestObj's toString() is inserted in place of its "{}", resulting in
> it being logged twice in a malformed fashion.
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