From 642612e1c3243c73af45090c52707da6d316229d Mon Sep 17 00:00:00 2001
From: Agaricus <agaricusb@yahoo.com>
Date: Tue, 22 Jan 2013 00:17:01 -0800
Subject: [PATCH] Allow remapping jars without Main-Class attribute (ex: Bukkit
 plugins)

---
 src/main/java/net/md_5/specialsource/Jar.java | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/main/java/net/md_5/specialsource/Jar.java b/src/main/java/net/md_5/specialsource/Jar.java
index 87da80c..5bd1292 100644
--- a/src/main/java/net/md_5/specialsource/Jar.java
+++ b/src/main/java/net/md_5/specialsource/Jar.java
@@ -35,7 +35,9 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
+import java.util.jar.Attributes;
 import java.util.jar.JarFile;
+import java.util.jar.Manifest;
 import java.util.zip.ZipEntry;
 import lombok.AccessLevel;
 import lombok.EqualsAndHashCode;
@@ -104,7 +106,19 @@ public class Jar {
 
     public static Jar init(File file) throws IOException {
         JarFile jarFile = new JarFile(file);
-        String main = jarFile.getManifest().getMainAttributes().getValue("Main-Class").replace('.', '/');
+        String main = null;
+
+        Manifest manifest = jarFile.getManifest();
+        if (manifest != null) {
+            Attributes attributes = manifest.getMainAttributes();
+            if (attributes != null) {
+                String mainClassName = attributes.getValue("Main-Class");
+                if (mainClassName != null) {
+                    main = mainClassName.replace('.', '/');
+                }
+            }
+        }
+
         return new Jar(jarFile, main);
     }
 }