CODEWITHSUNDEEP
javatomcat
P-S
P-S

Reputation: 4016

Using ClassLoader.getSystemResource to get file path in JAVA

I'm writing a dynamic web module using Tomcat 7 with Eclipse and Java 8, and my problem is that a required JAVA project on the build path is using the following to load files (lexicons, dictionaries, etc):

String filePath = "conf/test.txt"; // my test file is in WEB-INF/conf
String absolutePath = ClassLoader.getSystemResource(filePath).getPath();

I'm getting a null pointer so it's not finding the file.

When using the following, it finds the file:

String absolutePath = new File(filePath).getAbsolutePath();

The problem is:

I am required to use ClassLoader.getSystemResource. How can I specify my file's path for it to work without getting a null pointer (without using absolute paths too)?

Upvotes: 3

Views: 14551

Answers (2)

Ducaz035
Ducaz035

Reputation: 3132

Problem you have is that SystemClassLoader used to start the program, so given you are trying to search for a resource in a web container such as tomcat, this will NOT work.

If I were you, I would just use the following,

this.getClass().getResource(“/top.txt”)

Upvotes: 5

Gaurav
Gaurav

Reputation: 126

Use below please...
String tempPath = new File("").getAbsolutePath();
String filePath=tempPath+"conf/test.txt";

use ClassLoader.getResource() and below is explanation...

ClassLoader::getSystemResource() uses the system classloader. This uses the classpath that was used to start the program. If you are in a web container such as tomcat, this will NOT pick up resources from your WAR file.

Class<T>.getResource() prepends the package name of the class to the resource name, and then delegates to its classloader. If your resources are stored in a package hierarchy that mirrors your classes, use this method.

ClassLoader.getResource() delegates to its parent classloader. This will eventually search for the resource all the way upto the system classloader.

Upvotes: -2

Related Questions