I have written code that uses classes in jar files for Twitter4J API. I want to run my code through a command prompt. How would I do that? I tried:
$ javac -cp [path-to-twitter4j-jars] MyCode.java
It got compiled successfully, but when i run it by
$ java MyCode
But it does not find the Twitter4J classes. I am creating an instance of that class in my code.
Could anybody please help me on this issue?
The classpath is where Java searches for actual .class files in fodlers by package.
Java does not look at JARs that are inside classpath folders.
You need to put the JAR file itself in the classpath; not the folder that contains it.
(alternatively, you can include folder/*.jar to put every JAR in that folder in the classpath)
The JAR files still need to be on the classpath when running your application, not just when compiling.
When running your Java application, the JVM needs to know about the jars also.
java -cp [path-to-twitter4j-jars] MyCode
Here's a link to java command-line options.
Add jars to classpath:
java -cp .:path/to/twitter4j/jars MyCode
Docs:
where options include:
-d32 use a 32-bit data model if available
-d64 use a 64-bit data model if available
-server to select the "server" VM
The default VM is server,
because you are running on a server-class machine.
-cp <class search path of directories and zip/jar files>
-classpath <class search path of directories and zip/jar files>
A : separated list of directories, JAR archives,
and ZIP archives to search for class files.
-D<name>=<value>
set a system property
-verbose:[class|gc|jni]
enable verbose output
-version print product version and exit
-version:<value>
require the specified version to run
-showversion print product version and continue
-jre-restrict-search | -no-jre-restrict-search
include/exclude user private JREs in the version search
-? -help print this help message
-X print help on non-standard options
-ea[:<packagename>...|:<classname>]
-enableassertions[:<packagename>...|:<classname>]
enable assertions with specified granularity
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
disable assertions with specified granularity
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:<libname>[=<options>]
load native agent library <libname>, e.g. -agentlib:hprof
see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:<pathname>[=<options>]
load native agent library by full pathname
-javaagent:<jarpath>[=<options>]
load Java programming language agent, see java.lang.instrument
-splash:<imagepath>
show splash screen with specified image
$ javac -cp [path-to-twitter4j-jars] MyCode.java $ java -cp .:[path-to-twitter4j-jars/myjar.jar] MyCode