hucsmn opened a new issue, #1626:
URL: https://github.com/apache/logging-log4j2/issues/1626
## Description
Message pattern `"\\\\{}"` causes `ArrayIndexOutOfBoundsException` if
ParameterizedMessage.init()
## Configuration
Default spring boot configuration.
**Version:** [Log4j version]
Known reproducable versions: 2.12.0 - 2.20.0
**Operating system:** [OS and version]
Windows 10
**JDK:** [JDK distribution and version]
Oracle JDK 1.8u362
## Logs
```
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 2
at
org.apache.logging.log4j.message.ParameterFormatter.countArgumentPlaceholders2(ParameterFormatter.java:121)
at
org.apache.logging.log4j.message.ParameterizedMessage.init(ParameterizedMessage.java:149)
at
org.apache.logging.log4j.message.ParameterizedMessage.<init>(ParameterizedMessage.java:123)
at
org.apache.logging.log4j.message.ParameterizedMessage.<init>(ParameterizedMessage.java:132)
at
org.apache.logging.log4j.message.ParameterizedMessageFactory.newMessage(ParameterizedMessageFactory.java:70)
at
org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2033)
at
org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1899)
at org.apache.logging.slf4j.Log4jLogger.error(Log4jLogger.java:304)
......
```
## Reproduction
```java
package org.apache.logging.log4j.message;
public class Test {
private static final String testMsg1 = "\\\\{}";
private static final String testMsg2 = "\\\\{} blabla";
private static final String[] testArgs = {"a"};
public static void main(String[] args) {
System.out.println(formatUsingReusableParameterizedMessage(testMsg2)); // \a
blabla
System.out.println(formatUsingParameterizedMessage(testMsg2));
// \a blabla
System.out.println(formatUsingReusableParameterizedMessage(testMsg1)); // \a
System.out.println(formatUsingParameterizedMessage(testMsg1));
// throws ArrayIndexOutOfBoundsException
}
public static String formatUsingParameterizedMessage(final String msg) {
return new ParameterizedMessage(msg, testArgs).getFormattedMessage();
}
public static String formatUsingReusableParameterizedMessage(final
String msg) {
return new ReusableParameterizedMessage().set(msg,
testArgs).getFormattedMessage();
}
}
```
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