Please address the comments from this code review:

## Overall Comments
- In parseDependencies, after splitting the deps string you should trim each entry and filter out any blank tokens to avoid stray empty dependency names if there are trailing commas or extra whitespace.
- In isDependencyMissing, validate that the split on ':' yields exactly three segments before indexing and catch specific exceptions rather than Exception to avoid masking unintended errors.
- Dropping the custom URLClassLoader overrides changes the plugin isolation and logging package loading order—please verify that the default parent-first delegation still meets your plugin isolation and conflict-avoidance requirements.

## Individual Comments

### Comment 1
<location> `src/main/java/com/mikuac/shiro/core/PluginManager.java:92-98` </location>
<code_context>
             if (manifest != null) {
                 String deps = manifest.getMainAttributes().getValue("Dependencies");
-                if (deps != null) {
+                if (deps != null && !deps.isEmpty()) {
                     dependencies.addAll(Arrays.asList(deps.split(",\\s*")));
                 }
</code_context>

<issue_to_address>
**suggestion:** Consider trimming whitespace before checking for empty dependencies.

Currently, a 'Dependencies' value with only whitespace will be considered non-empty. Trim the string before checking to avoid this issue.

```suggestion
            Manifest manifest = jar.getManifest();
            if (manifest != null) {
                String deps = manifest.getMainAttributes().getValue("Dependencies");
                if (deps != null) {
                    String trimmedDeps = deps.trim();
                    if (!trimmedDeps.isEmpty()) {
                        dependencies.addAll(Arrays.asList(trimmedDeps.split(",\\s*")));
                    }
                }
            }
```
</issue_to_address>

### Comment 2
<location> `src/main/java/com/mikuac/shiro/core/PluginManager.java:122` </location>
<code_context>
+            String[] parts = groupArtifact.split(" :", 3);
</code_context>

<issue_to_address>
**issue (bug_risk):** Add validation for groupArtifact format to avoid ArrayIndexOutOfBoundsException.

Validate that groupArtifact contains at least two colons before splitting and accessing parts[2] to prevent runtime exceptions.
</issue_to_address>

### Comment 3
<location> `src/main/java/com/mikuac/shiro/core/PluginManager.java:129` </location>
<code_context>
+                    .resolve(version)
+                    .resolve("%s-%s.jar".formatted(artifact, version));
+            return !jarPath.toFile().exists();
+        } catch (Exception e) {
             return true;
         }
</code_context>

<issue_to_address>
**suggestion (bug_risk):** Catching generic Exception may mask unrelated errors.

Use a more specific exception type in the catch block to avoid hiding unrelated errors.

Suggested implementation:

```java
        try {
            String[] parts = groupArtifact.split(":", 3);
            val group = parts[0];
            val artifact = parts[1];
            val version = parts[2];
            val jarPath = DependencyResolver.DEPENDENCIES_DIR.toPath()
                    .resolve(group.replace('.', '/'))
                    .resolve(artifact)
                    .resolve(version)
                    .resolve("%s-%s.jar".formatted(artifact, version));
            return !jarPath.toFile().exists();

        } catch (java.nio.file.InvalidPathException | java.io.IOException e) {
            return true;
        }

```

If there are other exceptions that are commonly thrown in your context (e.g., SecurityException), consider adding them to the catch block. If you have custom exception handling conventions, adjust the exception types accordingly.
</issue_to_address>