Use System.getenv instead of System.getProperty. Note that you can also get the effective classpath for the current Java process with:
System.getProperty("java.class.path");
And that this value can, and in most cases will, be different from whatever your CLASSPATH environment variable is setup to be.
Use System.getenv instead of System.getProperty. Note that you can also get the effective classpath for the current Java process with:
System.getProperty("java.class.path");
And that this value can, and in most cases will, be different from whatever your CLASSPATH environment variable is setup to be.
Because CLASSPATH and PATH are environment variables, not Java System Properties. System properties can be passed to your java process using -Dkey=value.
Try using System.getenv() instead.
jdk/bin/jpsshould list all the java process IDs running that system- subsequently invoke
jdk/bin/jinfo <pid>to see lot of information... what you require is also there...
No need to print the default classpath. In Java, the default classpath is just the current directory:
If -classpath and -cp are not used and CLASSPATH is not set, the user class path consists of the current directory (.).
(documentation of java:)
Note: For completeness' sake: Theree are two other paths where java will look for stuff:
- the bootstrap class path
- the extension directory
The bootstrap class path by default points to parts of the JDK, and you almost never want to mess with it (unless you want to override part of the JDK), so you probably should not worry about it. The extension directories are for extending the JDK; see http://docs.oracle.com/javase/7/docs/technotes/guides/extensions/index.html
java - Listing available classes in current classpath using a command line tool - Stack Overflow
java - How to change the classpath in command prompt? - Stack Overflow
Java : How to use a -classpath in the command prompt.
debugging - How to debug classpath command line option (-cp) for java executable? - Stack Overflow
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You can use javap:
$ javap java.lang.String
Compiled from "String.java"
public final class java.lang.String implements java.io.Serializable
[...]
$ javap no.such.Class
Error: class not found: no.such.Class
You can use the -verbose option of the java command and search for the fully qualified name of a specific class.
$ java -verbose -jar MyProgram.jar | grep "java.lang.String" [Loaded java.lang.String from /Library/Java/…/Contents/Home/jre/lib/rt.jar] [Loaded java.lang.StringBuffer from /Library/Java/…/Contents/Home/jre/lib/rt.jar] …
Addendum: I want to check the class availability for an environment.
If you are running from the java command line, either the paths specified in the -classpath option or the CLASSPATH environment variable will be searched. If you are running from a JAR, the manifest's Class-Path attribute, for example, supplants these settings.
If you are trying to find a required JAR that may not be accessible in these ways, you'll have to search the file system. I use a combination of find, jar and grep, typically focussing on paths defined in system properties such as java.endorsed.dirs and java.ext.dirs; several related approaches are shown here.
As per my understanding you want to change the classpath which you have set by command
set classpath=d:java
can be done
in two ways either you can set classpth directly as environment varible by
--> Right click on my computer select advanced options
--> there you will see option as environment variables open that option
--> now you will see multiple variables being set...search for classpath variable if it exist
their edit this variable value by just putting semicolon and write ur full classpath ended by semicolon and save it.
FOR EG:-
variable name:- CLASSAPTH
variable value- .;C:\Oracle\product\10.1.0\Client_2\jdbc\lib\ojdbc14.jar;
Second option is just set your class in command promt as u have set earlier
by opening command prompt
set classpath=C:\Oracle\product\10.1.0\Client_2\jdbc\lib\ojdbc14.jar;
both the method are easy but i would prefer you should go with first one as by doing that you didn't need to set your classpath again and again after you reboot your system or application.
If u want to do while running your java program ,you can use
java -classpath C:\java\MyClasses utility.myapp.Cool
for more details about class path see oracle documentation about classpath.
So I have two different .java files in two different directories. One contains the main method which calls the other one through its method name. . This is in the directory
E:\JavaWorld\TardyCoder\temp1
Here is my program which contains the main method with the fileName Lemons.java
public class Lemons{
public static void main(String args[]){
Sorra sorraObject = new Sorra();
sorraObject.testName();
}
}My another program is in the directory
E:\JavaWorld\TardyCoder\temp2
Here is my program Sorra.java which doesn't contain the main method.
class Sorra{
public void testName(){
System.out.println("My name is Khan.");
}
}I used -sourcepath to create two .class files like this:
E:\JavaWorld\TardyCoder\temp1>javac -sourcepath E:\JavaWorld\TardyCoder\temp2 Lemons.java
Everything worked perfectly and i got two .class files in their respective directories.
Now I tried to use the -classpath to get the output like this:
E:\JavaWorld\TardyCoder\temp1>java -classpath .; E:\JavaWorld\TardyCoder\temp2 Lemons
But I'm getting an error :(
Error: Could not find or load main class E:\JavaWorld\TardyCoder\temp2
Please explain the right way to use -classpath in command prompt.
Edit: Got the answer. There should be no space after .;
Java doesn't use the PATH variable.
To specify the classpath when running a java application use the -cp parameter for the java command.
Inside your batch file (the .cmd file) find the java command and add the needed jar file:
java -cp somefile.jar;\path\to\jython.jar someclass.MainMethod
Please don't use the deprecated CLASSPATH any more.
For more details, please see the Java documentation:
http://docs.oracle.com/javase/6/docs/technotes/tools/windows/classpath.html#tooloption
use the following command
set classpath="path to your jar/jython.jar";
From the command line I would use
jinfo < pid >
which will give you this information and more
You can write a small application to connect via JMX and query the mbean java.lang.Runtime. It has an attribute "ClassPath".
import java.lang.management.*
ManagementFactory.getRuntimeMXBean().getClassPath()