How to compile all files in directory to *.class files?
Well, this seems pretty obvious, so I may be missing something
javac *.java
(With appropriate library references etc.)
Or perhaps:
javac -d bin *.java
to javac create the right directory structure for the output.
Were you looking for something more sophisticated? If so, could you give more details (and also which platform you're on)?
Yet another way using "find" on UNIX is described here:
http://stas-blogspot.blogspot.com/2010/01/compile-recursively-with-javac.html
The following two commands will compile all .java files contained within the directory ./src and its subdirectories:
find ./src -name *.java > sources_list.txt
javac -classpath "${CLASSPATH}" #sources_list.txt
First, find generates sources_list.txt, a file that contains the paths to the Java source files. Next, javac compiles all these sources using the syntax #sources_list.txt.
Here's a code fragment that I use to build an entire project where, as usual, source files are in a deeply nested hierarchy and there are many .jar files that must go into the classpath (requires UNIX utilities):
CLASSPATH=
for x in $(find | grep jar$); do CLASSPATH="$CLASSPATH:$x"; done
SRC=$(find | grep java$)
javac -cp "$CLASSPATH" $SRC
Related
I'm trying to run java from the command line, and haven't had to include extra packages with the javac command before and I can't figure out what I'm doing wrong.
I'm running javac -d bin -cp jar1:jar2:...:jarN:PackageName MyClass.java but I'm still getting an error: package PackageName does not exist
I'm using the absolute paths for everything, and I also tried individually listing the java files inside the package but that didn't work either. I'm using a colon since I'm on a mac.
Anyone know what I am doing wrong? Thanks for any help!
I realized that I needed to compile the java files in PackageName before I could compile MyClass.java, which depended on them. So what I needed to do was: javac -d bin -cp jar1:jar2:...:jarN PackageName/*.java and then I could compile MyClass.java with bin added to the classpath as well as the jars.
I'm build a jar file with code that uses other jar files as dependencies, and I can't get it to run (I keep getting a NoClassDefFoundError).
All the other similar issues I could find online used maven as a solution, which I want to avoid doing. When I run my code like this:
#!/bin/bash
java -cp "src/.:src/jsoup-1.9.2.jar:src/commons-cli-1.3.1.jar" WikipediaWords $#
it runs fine, but when I try:
java -cp "src/.:src/jsoup-1.9.2.jar:src/commons-cli-1.3.1.jar" -jar WikipediaWords.jar $#
it complains.
I compile my jar file with all the dependencies inside, though, so I really have no clue why it can't find anything. Ideally, I wouldn't even want to have to add the -cp path to my java execution, and just have the jar file know to use the nested jar dependency files.
If you have any clue about how to solve this (run the jar file without class def error) without the use of Maven, please let me know!
Thanks in advance!
P.S. My building code might be of use:
#!/bin/bash
javac -cp "src/.:src/jsoup-1.9.2.jar:src/commons-cli-1.3.1.jar" src/WikipediaWords.java
jar cfm src/WikipediaWords.jar src/Manifest.txt -C src/ .
Try running the below command:
java -cp "src/.:src/jsoup-1.9.2.jar:src/commons-cli-1.3.1.jar:WikipediaWords.jar" WikipediaWords $#
OR
java -cp "WikipediaWords.jar:src/.:src/jsoup-1.9.2.jar:src/commons-cli-1.3.1.jar" WikipediaWords $#
I downloaded a sample code written in java that has multiple jar files and java files. I am not a Java programmer so I am having a hard time compiling the code. Here's my attempt:
javac -classpath lib/*.jar src/*.java
However this is what I get:
javac: invalid flag: lib/dom4j-1.6.1.jar
Usage: javac <options> <source files>
use -help for a list of possible options
What's wrong with my approach and how can I compile the code? ALl the jar files are located in the lib folder, and the java files in the src folder.
You need to stop the shell from globbing the wild-card in lib/*.jar by escaping it.
Also, you need to remove the .jar suffix ... because that's how classpath wildcards work; see Oracle's "Setting the classpath" document.
So ...
javac -classpath lib/\* src/*.java
Using an IDE is another option. However, if all you want to do is compile and run, then downloading and installing and learning to use an IDE is overkill (IMO). And the flipside is that it is good for an IDE-using Java programmer to also understand how to compile and run from the shell prompt ...
old post, but thought below details help,
you can specify jar files by separating by ; in windows and : in unix
Eg: (windows)
javac -cp first.jar;second.jar;third.jar YourClass.java
(unix)
javac -cp first.jar:second.jar:third.jar YourClass.java
Source: https://gullele.com/pass-all-the-jars-in-classpath-when-compiling-java/
I just got a makefile like this
CLASSPATH=.:/usr/share/java/antlr.jar
Mipsim.class: Mipsim.java MipsimLexer.class MipsimLexerTokenTypes.class MipsimParser.class Memory.class Processor.class
javac -classpath .:/usr/share/java/antlr.jar Mipsim.java
Memory.class: Memory.java MemoryAccessible.class
javac Memory.java
Processor.class: Processor.java
javac Processor.java
MemoryAccessible.class: MemoryAccessible.java
javac MemoryAccessible.java
MipsimLexer.java MipsimLexerTokenTypes.java MipsimParser.java: Mipsim.g
antlr Mipsim.g
MipsimLexerTokenTypes.class: MipsimLexerTokenTypes.java
javac MipsimLexerTokenTypes.java
MipsimLexer.class: MipsimLexer.java
javac MipsimLexer.java
MipsimParser.class: MipsimParser.java
javac MipsimParser.java
clean:
rm -f *.class MipsimLexer.* MipsimLexerTokenTypes.* MipsimParser.*
I have to run this make file, and build the object code.
However, the terminal told this
antlr Mipsim.g
make: antlr: No such file or directory
make: *** [MipsimLexer.java] Error 1
I guess probably anrlr.jar couldn't be found in this case. So I just changed the CLASSPATH into
CLASSPATH=.:/antlr.jar
and put antlr.jar in the same folder, then tried it again. The same error just happened again.....
Could somebody please help me out?
Thanks
CLASSPATH=.:/antlr.jar
That's not going to work. It says to use the current directory and the antlr.jar file in the root file system (which probably won't exist).
You may want to try:
CLASSPATH=.:./antlr.jar
And make sure that it exists for the duration of the antlr executable. Some make programs will execute each command in a separate shell so changing the CLASSPATH may not carry forward. I tend to use the bash "set variable for one process" method:
CLASSPATH=.:./antlr.jar antlr Mipsim.g
On top of that, the way you generally run antlr is by running java, giving the class you want to run, with something like:
java -cp ./antlr.jar org.antlr.Tool Mipsim.g
If you have an executable file (or script) antlr which will do that for you, it appears not to be in your path.
I have a package called studentServer which contains two sub packages student and common.
The common folder has references to the student package and i would like to be able to compile this. How could i do this?
javac student\*.java - compiles the student package
but when i try something similar with the common package errors are thrown - I understand it's something to do with the classpath
javac -verbose -classpath "\student" common\*.java
But I couldn't get this working. Any help would be great.
http://pastebin.com/m2a2f5d5d - here's the output from the compiler
This is a bit vague, but I suspect the classpath for the student code is wrong. Try without the leading backslash.
If you have a directory structure
source/
studentServer/
student/
common/
classes/
And you're in the directory above source, then you want to set the source path to 'source' with the -sourcepath option. You probably also want to use the -d option to tell javac where to put the compiled classes, so they aren't all mixed up with the source:
java -d classes -sourcepath source source/studentServer/student/*.java source/studentServer/common/*.java
go like this
c:\>
use change directory command cd until you get the desired directory
(ex: c:\javaEx\proj1\)
now
cd javaEx go like this
c:\javaEx\proj1\javac *.java
now compilation done in all java files in the proj1 directory.