diff --git a/src/main/java/me/skymc/taboolib/TabooLibLoader.java b/src/main/java/me/skymc/taboolib/TabooLibLoader.java
index 3598311..6f6cda6 100644
--- a/src/main/java/me/skymc/taboolib/TabooLibLoader.java
+++ b/src/main/java/me/skymc/taboolib/TabooLibLoader.java
@@ -209,7 +209,9 @@ public class TabooLibLoader implements Listener {
         loaders.forEach(loader -> {
             try {
                 loader.preLoad(plugin, loadClass);
-            } catch (Throwable ignored) {
+            } catch (NoClassDefFoundError ignore) {
+            } catch (Throwable e) {
+                e.printStackTrace();
             }
         });
     }
@@ -218,7 +220,9 @@ public class TabooLibLoader implements Listener {
         loaders.forEach(loader -> {
             try {
                 loader.postLoad(plugin, loadClass);
-            } catch (Throwable ignored) {
+            } catch (NoClassDefFoundError ignore) {
+            } catch (Throwable e) {
+                e.printStackTrace();
             }
         });
     }
@@ -227,7 +231,9 @@ public class TabooLibLoader implements Listener {
         loaders.forEach(loader -> {
             try {
                 loader.unload(plugin, loadClass);
-            } catch (Throwable ignored) {
+            } catch (NoClassDefFoundError ignore) {
+            } catch (Throwable e) {
+                e.printStackTrace();
             }
         });
     }
diff --git a/src/main/java/me/skymc/taboolib/commands/builder/SimpleCommandBuilder.java b/src/main/java/me/skymc/taboolib/commands/builder/SimpleCommandBuilder.java
index 76438ad..658d2b7 100644
--- a/src/main/java/me/skymc/taboolib/commands/builder/SimpleCommandBuilder.java
+++ b/src/main/java/me/skymc/taboolib/commands/builder/SimpleCommandBuilder.java
@@ -20,8 +20,8 @@ public class SimpleCommandBuilder {
     public static final CompleterTab EMPTY_COMPLETER_TAB = ((sender, args) -> new ArrayList<>());
     public static final CompleterCommand EMPTY_COMPLETER_COMMAND = ((sender, args) -> false);
 
-    private final String command;
-    private final Plugin plugin;
+    private String command;
+    private Plugin plugin;
     private String description;
     private String usage;
     private List<String> aliases;
@@ -34,8 +34,6 @@ public class SimpleCommandBuilder {
     private boolean build;
 
     SimpleCommandBuilder(String command, Plugin plugin) {
-        Preconditions.checkNotNull(command, "command cannot not be null");
-        Preconditions.checkNotNull(plugin,  "plugin cannot not be null");
         this.command = command;
         this.plugin = plugin;
         this.description = "";
@@ -49,6 +47,16 @@ public class SimpleCommandBuilder {
         return new SimpleCommandBuilder(command.toLowerCase(), plugin);
     }
 
+    public SimpleCommandBuilder command(String command) {
+        this.command = command;
+        return this;
+    }
+
+    public SimpleCommandBuilder plugin(Plugin plugin) {
+        this.plugin = plugin;
+        return this;
+    }
+
     public SimpleCommandBuilder description(String description) {
         this.description = description;
         return this;
@@ -94,11 +102,9 @@ public class SimpleCommandBuilder {
         return this;
     }
 
-    public boolean isBuild() {
-        return build;
-    }
-
     public SimpleCommandBuilder build() {
+        Preconditions.checkNotNull(plugin, "缺少 \"plugin\" 部分");
+        Preconditions.checkNotNull(command, "缺少 \"command\" 部分");
         Preconditions.checkNotNull(completerCommand, "缺少 \"CompleterCommand\" 部分");
         Preconditions.checkNotNull(completerTab, "缺少 \"CompleterTab\" 部分");
         if (forceRegister) {
@@ -118,4 +124,58 @@ public class SimpleCommandBuilder {
         build = true;
         return this;
     }
+
+    // *********************************
+    //
+    //        Getter and Setter
+    //
+    // *********************************
+
+    public String getCommand() {
+        return command;
+    }
+
+    public Plugin getPlugin() {
+        return plugin;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public String getUsage() {
+        return usage;
+    }
+
+    public List<String> getAliases() {
+        return aliases;
+    }
+
+    public String getPermission() {
+        return permission;
+    }
+
+    public String getPermissionMessage() {
+        return permissionMessage;
+    }
+
+    public CompleterTab getCompleterTab() {
+        return completerTab;
+    }
+
+    public CompleterCommand getCompleterCommand() {
+        return completerCommand;
+    }
+
+    public boolean isSilence() {
+        return silence;
+    }
+
+    public boolean isForceRegister() {
+        return forceRegister;
+    }
+
+    public boolean isBuild() {
+        return build;
+    }
 }
diff --git a/src/main/java/me/skymc/taboolib/common/inject/TInjectLoader.java b/src/main/java/me/skymc/taboolib/common/inject/TInjectLoader.java
index 1d63581..802de72 100644
--- a/src/main/java/me/skymc/taboolib/common/inject/TInjectLoader.java
+++ b/src/main/java/me/skymc/taboolib/common/inject/TInjectLoader.java
@@ -2,6 +2,7 @@ package me.skymc.taboolib.common.inject;
 
 import com.google.common.collect.Maps;
 import com.ilummc.tlib.logger.TLogger;
+import me.skymc.taboolib.TabooLib;
 import me.skymc.taboolib.TabooLibLoader;
 import me.skymc.taboolib.commands.builder.SimpleCommandBuilder;
 import me.skymc.taboolib.common.configuration.TConfiguration;
@@ -65,6 +66,9 @@ public class TInjectLoader implements TabooLibLoader.Loader {
                 if (builder.isBuild()) {
                     TLogger.getGlobalLogger().error("Command was registered.  (" + field.getType().getName() + ")");
                 } else {
+                    if (builder.getPlugin() == null) {
+                        builder.plugin(plugin);
+                    }
                     builder.build();
                 }
             } catch (Exception e) {
@@ -88,8 +92,12 @@ public class TInjectLoader implements TabooLibLoader.Loader {
                 try {
                     declaredField.setAccessible(true);
                     injectTypes.get(Plugin.class).run(plugin, declaredField, annotation.value());
-                } catch (Exception e) {
+                    TabooLib.debug(declaredField.getName() + " injected. (" + declaredField.getType().getName() + ")");
+                } catch (Throwable e) {
                     TLogger.getGlobalLogger().error(declaredField.getName() + " inject failed: " + e.getMessage() + " (" + declaredField.getType().getName() + ")");
+                    if (e.getMessage() == null) {
+                        e.printStackTrace();
+                    }
                 }
             }
         }
@@ -114,8 +122,12 @@ public class TInjectLoader implements TabooLibLoader.Loader {
             try {
                 declaredField.setAccessible(true);
                 tInjectTask.run(plugin, declaredField, annotation.value());
-            } catch (Exception e) {
+                TabooLib.debug(declaredField.getName() + " injected. (" + declaredField.getType().getName() + ")");
+            } catch (Throwable e) {
                 TLogger.getGlobalLogger().error(declaredField.getName() + " inject failed: " + e.getMessage() + " (" + declaredField.getType().getName() + ")");
+                if (e.getMessage() == null) {
+                    e.printStackTrace();
+                }
             }
         }
     }