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
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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.
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()
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.