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Is it possible to compile and emit .class files at run time? I have some generated servlet code and I want to compile them into classes and package it as a war.
Thanks.
Just export the generated codes into files in a temp directory, invoke javac in there, package them, serve them. Nothing fancy needed.
Yes, it is.
You can take a look at the Java Compiler API doc
Note however, that you will have to provide the corresponding ClassLoader and manage all the resources yourself.
If you want to generate bytecode from non-Java sources, you can also use ASM directly:
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I have an existential question, I have a project that has some errors and it marks some packages in red, I wonder if when compiling these affect my .class files that will later be uploaded to the webapps folder where I have my program deployed?
Thank you.
Red usually means compilation errors, which means that if you didn't compile them earlier there are no class files to affect (because they don't even exist) and if you did compile earlier it means that those class files will be outdated.
In other words, your mission is to not have compiler errors to begin with, not wondering how it will affect existing compilation artifacts.
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Is there a way to add custom rules to languageTool java API just by appending rules to grammar.xml and keeping it external to the java project?
I want to deploy my java project only once, but keep updating the grammar rules whenever required. I would like to keep the xml file (say grammar.xml) separately from the project, and access it through java code.
Thanks !
It should be possible to load XML rules with PatternRuleLoader and then activate them using JLanguageTool.addRule(). I'm not sure what will happen when you insert the same rule (i.e. a rule with the same id) more than once.
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i've to modify a plugin for my minecraft server (yes, i'm allowed to do it).
The problem is that the files that i've to modify have .class extension and despite a found a way to see those files with jd-Gui, i did not found a way to edit them. Can you please explain me step by step how to do it?
p.s. I use MacOsX system.
Thanks to all of you.
It is not a good idea to edit .class files because of dependencies and relationship with other classes. Also because .class contains byte information and not recommended (not possible in many cases) to edit it manually. The file is generated when you compile your java file. So, find the java source file, compile it, and it will update the .class file.
Good luck.
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I am trying to generate slice of the program in java and need a way to generate program dependence graph of the program in java, please help me to generate program dependence graph. I have tried JFlex I dont know it is right or not,but it did generate DFA and NDFA. but I dont understand how it works, if you ever used it please comment.
If you are using maven try dependency plugin: mvn depedency:tree
I'm using IVY with ANT, you can simply put in the build.xml this line
<ivy:report graph="false">
It will generate an html file with the summary of the dependencies.
If you want remove graph="false" of course ;)
here the documentation
http://ant.apache.org/ivy/history/2.1.0/use/report.html
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I have to make a call from my java code to some other classes that is within jar file .So which protocol it is going to use .
Regards,
Raj
What do you mean by protocol? a jar is an ordinary zip file. You just need to include the jar in your classpath and you are good to go.
It does not need any protocol. The class file inside the Jar would be accessed directly just like any other class on your classpath.
If you have a run-able jar which contains runnable program with main class just use
java -jar < your jar file here >(if you want to run it)
otherwise import it to your project.(not sure what you mean by mentioning about a protocol)