Edit: I figured out what the problem was. It was because I was compiling the class with JavaSE-1.8 in Eclipse. This lead to a java.lang.UnsupportedClassVersionError. So I changed the JRE System Library to J2SE-1.5. Now it runs just fine. I found all this out by looking at the crash.log file.
I made a kindlet using a combonation of this tutorial and this tutorial. When I put it on my jailbroken K4 after signing it, I get a Main class not found error when I try to launch it.
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This is what my mainifest looks like:
I created the manifest and jar with Eclipse. I used the hello world example code in the second tutorial I linked. My main class is where it says it is when I look into the jar, so I don't understand why I am getting this error.
I made a kindlet using a combonation of this tutorial and this tutorial. When I put it on my jailbroken K4 after signing it, I get a Main class not found error when I try to launch it.

This is what my mainifest looks like:
Code:
Manifest-Version: 1.0
Main-Class: testProject.segadude.test.Main
Implementation-Title: Hello
Implementation-Version: 1
Implementation-Vendor: segadude
Extension-List: SDK
SDK-Extension-Name: com.amazon.kindle.kindlet
SDK-Specification-Version: 1.3
Toolbar-Mode: persistent
Font-Size-Mode: point