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    <p>Perhaps the FileInputStream isn't able to honor the properties "file" which is inside your jar file. Change your:</p> <pre><code>this.runController = new Properties(); this.propertiesLocation = this.getClass().getClassLoader().getResource(this.PROPERTIESFILELOCATION); FileInputStream propsInput = new FileInputStream(this.propertiesLocation.getFile()); this.runController.load(propsInput); </code></pre> <p>to:</p> <pre><code>this.runController = new Properties(); this.runController.load(this.getClass().getClassLoader().getResourceAsStream(this.PROPERTIESFILELOCATION)); </code></pre> <p>EDIT: I created a test class, and it shows that when running from the filesystem OR from a JAR file, that "props/main.properties" works but "/props/main.properties" does not:</p> <pre><code>[rtb@rtblinux props]$ cat org/dashrb/test/main.java package org.dashrb.test; import java.util.Properties; import java.io.IOException; public class main { public static void main(String args[]) { main myMain = new main(); myMain.testProps("props/main.properties"); myMain.testProps("/props/main.properties"); } public main() { } public void testProps(String p) { try { System.out.println("==============================="); Properties props = new Properties(); System.out.println("Trying to load properties as " + p); props.load(getClass().getClassLoader().getResourceAsStream(p)); System.out.println("Loaded properties as " + p); System.out.println("Property x is: " + props.getProperty("x")); } catch (IOException ioe) { ioe.printStackTrace(); } System.out.println("==============================="); } } [rtb@rtblinux props]$ cat props/main.properties x = This is the property value of x [rtb@rtblinux props]$ java -cp . org.dashrb.test.main =============================== Trying to load properties as props/main.properties Loaded properties as props/main.properties Property x is: This is the property value of x =============================== =============================== Trying to load properties as /props/main.properties Exception in thread "main" java.lang.NullPointerException at java.util.Properties$LineReader.readLine(Properties.java:434) at java.util.Properties.load0(Properties.java:353) at java.util.Properties.load(Properties.java:341) at org.dashrb.test.main.testProps(main.java:25) at org.dashrb.test.main.main(main.java:11) [rtb@rtblinux props]$ jar cvf main.jar org props added manifest adding: org/(in = 0) (out= 0)(stored 0%) adding: org/dashrb/(in = 0) (out= 0)(stored 0%) adding: org/dashrb/test/(in = 0) (out= 0)(stored 0%) adding: org/dashrb/test/main.class(in = 1218) (out= 679)(deflated 44%) adding: org/dashrb/test/main.java(in = 594) (out= 287)(deflated 51%) adding: props/(in = 0) (out= 0)(stored 0%) adding: props/main.properties(in = 36) (out= 36)(deflated 0%) [rtb@rtblinux props]$ jar tvf main.jar 0 Fri Jan 11 17:29:40 EST 2013 META-INF/ 68 Fri Jan 11 17:29:40 EST 2013 META-INF/MANIFEST.MF 0 Fri Jan 11 17:26:00 EST 2013 org/ 0 Fri Jan 11 17:26:00 EST 2013 org/dashrb/ 0 Fri Jan 11 17:29:24 EST 2013 org/dashrb/test/ 1218 Fri Jan 11 17:28:52 EST 2013 org/dashrb/test/main.class 594 Fri Jan 11 17:29:24 EST 2013 org/dashrb/test/main.java 0 Fri Jan 11 17:26:40 EST 2013 props/ 36 Fri Jan 11 17:26:40 EST 2013 props/main.properties [rtb@rtblinux props]$ cd / [rtb@rtblinux /]$ java -cp ~/misc/src/java/props/main.jar org.dashrb.test.main =============================== Trying to load properties as props/main.properties Loaded properties as props/main.properties Property x is: This is the property value of x =============================== =============================== Trying to load properties as /props/main.properties Exception in thread "main" java.lang.NullPointerException at java.util.Properties$LineReader.readLine(Properties.java:434) at java.util.Properties.load0(Properties.java:353) at java.util.Properties.load(Properties.java:341) at org.dashrb.test.main.testProps(main.java:25) at org.dashrb.test.main.main(main.java:11) </code></pre> <p>There must be something different in your situation which is preventing your success.</p>
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    1. POWhy can't my Java Application find my properties file
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    1. COI tried that I either get Null pointer for conf/runController.properties or for /conf/runController.properties I get null pointer on java.util.Properties$LineReader.readLine This is alla liltte baffling as I've never had such issues before
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    2. COI know you've looked at the names already. can you verify the capitalization? if you're on windows, filenames on the disk aren't case sensitive but (I believe) the contents of jar files are.
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    3. COFor sure. The capitalization is correct and consistent. The file is called runController.properties and is referred to as such.
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