How To Convert String to double (currentVer = Double.parseDouble(pdfFile.getVersion()))

I wanna convert the pdfFile.getVersion() to a double like so:

PHP:

private double currentVer = Double.parseDouble(pdfFile.getVersion());

But the MC Server print me out:

Code:

2011-12-14 19:40:02 [SEVERE] Could not load 'plugins\DontHitMe.jar' in folder 'plugins':
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:175)
    at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:215)
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:136)
    at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:151)
    at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:127)
    at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:52)
    at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:145)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:399)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)
Caused by: java.lang.NullPointerException
    at me.edocsyl.DontHitMe.DontHitMe.<init>(DontHitMe.java:35)
    ... 13 more

 

First, the problem seems to be located in file DontHitMe.java at line 35. Whatever that is.
Second, your double conversion might fail because pdfFile.getVersion() might return "9.0.1" or "9.0b" or another invalid value for a double. Well, whatever pdfFile is an instance of.

For better help please supply more information or wait until my magical crystal ball has returned from the repair shop.

 

You're trying to run this code in the constructor, but the PDF isn't available until onEnable().

 

I See the problem... Is there any other way to get the version as Double from the plugin.yml file?

 

Do it in onEnable

 

I tryed this, but it doesn't work.