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Formatting exception message #16

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Formatting exception message #16

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5211a23
Fixed class saving and formatting exception message
Chaarlesss Jan 13, 2017
539f90c
Verify the transformedClass is not null before using it
Chaarlesss Jan 14, 2017
b61e5a9
Removed NPE security
Chaarlesss Jan 14, 2017
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2 changes: 1 addition & 1 deletion src/main/java/net/minecraft/launchwrapper/LaunchClassLoader.java
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Original file line number Diff line number Diff line change
Expand Up @@ -180,7 +180,7 @@ public Class<?> findClass(final String name) throws ClassNotFoundException {
invalidClasses.add(name);
if (DEBUG) {
LogWrapper.log(Level.TRACE, e, "Exception encountered attempting classloading of %s", name);
LogManager.getLogger("LaunchWrapper").log(Level.ERROR, "Exception encountered attempting classloading of %s", e);
LogManager.getLogger("LaunchWrapper").log(Level.ERROR, String.format("Exception encountered attempting classloading of %s", name), e);
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This however, is fine, cuz derp.

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@jamierocks jamierocks Jan 23, 2018 •
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Why not use the proper log4j way of doing things - basically replace %s for {}, no String#format(String) needed.

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@jamierocks There does not appear to be an interface method that takes both a Throwable and params.

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I believe that log4j knows to use the last parameter as a Throwable when taking a series of other parameters; however, I cannot find a source.

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I would write it this way:

LogManager.getLogger("LaunchWrapper").error("Exception encountered attempting classloading of {}", name, e);

Internally the logger creates a FormattedMessage which can take a Throwable as the last argument:
https://logging.apache.org/log4j/log4j-2.1/log4j-api/apidocs/org/apache/logging/log4j/message/FormattedMessage.html

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Tracing through it doesn't use that constructor from the varargs method, but it does appear poke was correct as it seems to scan it at org.apache.logging.log4j.message.ParameterizedMessage#parseArguments

}
throw new ClassNotFoundException(name, e);
}
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