CODEWITHSUNDEEP
java
code-gijoe
code-gijoe

Reputation: 7244

Does javac optimize object files (*.class)?

I'm trying to limit changes from a jar file. I introduced a fix on the code, a very small fix in a single file. Javac compiler generates the new .class file and I plan to replace ONLY this single file in the jar (we had problems with the build and are unsure if the current build matches the production build).

I'm a C++ pro, but java... not so much. I wouldn't dare to do this in C++ as optimizers inline a lot of stuff from object files and static libs. I'm under the impression I can do this with no great consequences in java.

Any advice?

Upvotes: 2

Views: 242

Answers (2)

Avi
Avi

Reputation: 20152

The Java Language Specification defines binary compatibility between class files. In general, class files tend to be much more compatible than they would be in C, so you'll probably be ok. However, there are a few gotchas, such as static final fields (constants) which are inlined by the compiler.

In any case, the situation in which you are not sure what code code you have running in production, I would consider to be very dangerous, and try to fix as soon as possible.

Upvotes: 1

sgowd
sgowd

Reputation: 2262

I usually hot deploy files on server, that creates no problem in JAVA. You can do it as long as your compiler version is same as the other files. It would not be a problem.

Upvotes: 3

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