Warn if exceptions are caused by broken plugins

ProtocolLib/src/main/java/com/comphenix/protocol/error/PluginContext.java

@@ -34,6 +34,7 @@ public final class PluginContext {
 				return caller;
 			}
 		}
+
 		return null;
 	}
 	
@@ -41,25 +42,25 @@ public final class PluginContext {
 	 * Lookup the plugin that this method invocation belongs to, and return its file name.
 	 * @param element - the method invocation.
 	 * @return Plugin name, or NULL if not found.
-	 * 
 	 */
 	public static String getPluginName(StackTraceElement element) {
 		try {
-			if (Bukkit.getServer() == null)
+			if (Bukkit.getServer() == null) {
 				return null;
-			CodeSource codeSource = Class.forName(element.getClassName()).getProtectionDomain().getCodeSource();
+			}
 	
+			CodeSource codeSource = Class.forName(element.getClassName()).getProtectionDomain().getCodeSource();
 			if (codeSource != null) {
 				String encoding = codeSource.getLocation().getPath();
 				File path = new File(URLDecoder.decode(encoding, "UTF-8"));
 				File plugins = getPluginFolder();
 				
 				if (plugins != null && folderContains(plugins, path)) {
-					return path.getName();
+					return path.getName().replaceAll(".jar", "");
 				}
 			}
-			return null; // Cannot find it
 
+			return null; // Cannot find it
 		} catch (UnsupportedEncodingException e) {
 			throw new RuntimeException("Cannot lookup plugin name.", e);
 		} catch (ClassNotFoundException e) {
@@ -86,6 +87,7 @@ public final class PluginContext {
 		        return true;
 		    file = file.getParentFile();
 		}
+
 		return false;
 	}
 	
@@ -104,6 +106,7 @@ public final class PluginContext {
 				pluginFolder = folder;
 			}
 		}
+
 		return folder;
 	}
 }

ProtocolLib/src/main/java/com/comphenix/protocol/reflect/StructureModifier.java

@@ -24,12 +24,16 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.logging.Level;
 
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.error.PluginContext;
 import com.comphenix.protocol.reflect.compiler.BackgroundCompiler;
 import com.comphenix.protocol.reflect.instances.BannedGenerator;
 import com.comphenix.protocol.reflect.instances.DefaultInstances;
 import com.comphenix.protocol.reflect.instances.InstanceProvider;
 import com.comphenix.protocol.utility.MinecraftReflection;
+import com.comphenix.protocol.utility.Util;
 import com.google.common.base.Function;
 import com.google.common.base.Objects;
 import com.google.common.collect.ImmutableList;
@@ -179,14 +183,30 @@ public class StructureModifier<TField> {
 		this.useStructureCompiler = useStructureCompiler;
 	}
 
+	private static final List<String> BROKEN_PLUGINS = Util.asList("TagAPI");
+	
 	/**
 	 * Reads the value of a field given its index.
 	 * @param fieldIndex - index of the field.
 	 * @return Value of the field.
 	 * @throws FieldAccessException The field doesn't exist, or it cannot be accessed under the current security contraints.
 	 */
-	@SuppressWarnings("unchecked")
 	public TField read(int fieldIndex) throws FieldAccessException {
+		try {
+			return readInternal(fieldIndex);
+		} catch (FieldAccessException ex) {
+			String plugin = PluginContext.getPluginCaller(ex);
+			if (BROKEN_PLUGINS.contains(plugin)) {
+				ProtocolLibrary.log(Level.WARNING, "Encountered an exception caused by broken plugin {0}.", plugin);
+				ProtocolLibrary.log(Level.WARNING, "It is advised that you remove it.");
+			}
+
+			throw ex;
+		}
+	}
+
+	@SuppressWarnings("unchecked")
+	private TField readInternal(int fieldIndex) throws FieldAccessException {
 		if (target == null)
 			throw new IllegalStateException("Cannot read from a null target!");
 
@@ -288,6 +308,20 @@ public class StructureModifier<TField> {
 	 * @throws FieldAccessException The field doesn't exist, or it cannot be accessed under the current security contraints.
 	 */
 	public StructureModifier<TField> write(int fieldIndex, TField value) throws FieldAccessException {
+		try {
+			return writeInternal(fieldIndex, value);
+		} catch (FieldAccessException ex) {
+			String plugin = PluginContext.getPluginCaller(ex);
+			if (BROKEN_PLUGINS.contains(plugin)) {
+				ProtocolLibrary.log(Level.WARNING, "Encountered an exception caused by broken plugin {0}.", plugin);
+				ProtocolLibrary.log(Level.WARNING, "It is advised that you remove it.");
+			}
+
+			throw ex;
+		}
+	}
+
+	private StructureModifier<TField> writeInternal(int fieldIndex, TField value) throws FieldAccessException {
 		if (target == null)
 			throw new IllegalStateException("Cannot read from a null target!");
 

ProtocolLib/src/main/java/com/comphenix/protocol/utility/Util.java

@@ -1,6 +1,7 @@
 package com.comphenix.protocol.utility;
 
 import java.lang.reflect.Method;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
@@ -45,4 +46,13 @@ public class Util {
 
 		return (List<Player>) Bukkit.getOnlinePlayers();
 	}
+
+	public static <E> List<E> asList(E... elements) {
+		List<E> list = new ArrayList<E>();
+		for (E element : elements) {
+			list.add(element);
+		}
+
+		return list;
+	}
 }