Add a setting to specify the Maven project cache size

README.md

@@ -124,6 +124,7 @@ The following settings are supported:
 * `java.home` : **Deprecated, please use 'java.jdt.ls.java.home' instead.** Absolute path to JDK home folder used to launch the Java Language Server. Requires VS Code restart.
 * `java.jdt.ls.lombokSupport.enabled`: Whether to enable lombok support. Defaults to `true`.
 * `java.jdt.ls.vmargs` : Extra VM arguments used to launch the Java Language Server. Requires VS Code restart.
+* `java.jdt.ls.mavenProjectCacheSize`: Specifies the size of the in-memory Maven project cache to use. Increasing the project cache size will help load multi-module projects and monorepos faster, but will result in a significant increase in memory usage.
 * `java.errors.incompleteClasspath.severity` : Specifies the severity of the message when the classpath is incomplete for a Java file. Supported values are `ignore`, `info`, `warning`, `error`.
 * `java.trace.server` : Traces the communication between VS Code and the Java language server.
 * `java.configuration.updateBuildConfiguration` : Specifies how modifications on build files update the Java classpath/configuration. Supported values are `disabled` (nothing happens), `interactive` (asks about updating on every modification), `automatic` (updating is automatically triggered).

package.json

@@ -341,6 +341,16 @@
             "scope": "machine-overridable",
             "order": 20
           },
+          "java.jdt.ls.mavenProjectCacheSize": {
+            "type": [
+              "integer"
+            ],
+            "minimum": 1,
+            "default": 50,
+            "description": "Specifies the size of the in-memory Maven project cache to use. Increasing the project cache size will help load multi-module projects and monorepos faster, but will result in a significant increase in memory usage.",
+            "scope": "machine-overridable",
+            "order": 20
+          },
           "java.server.launchMode": {
             "type": "string",
             "enum": [

src/javaServerStarter.ts

@@ -257,6 +257,12 @@ function prepareParams(requirements: RequirementsData, workspacePath, context: E
 	} else {
 		vmargs = '';
 	}
+	if (vmargs.indexOf('-Dm2e.project.cache.size') < 0) {
+		const mavenProjectCacheSize = workspace.getConfiguration().get('java.jdt.ls.mavenProjectCacheSize');
+		if (mavenProjectCacheSize !== undefined && Number(mavenProjectCacheSize) > 0) {
+			params.push(`-Dm2e.project.cache.size=${mavenProjectCacheSize}`);
+		}
+	}
 	if (vmargs.indexOf('-DDetectVMInstallationsJob.disabled=') < 0) {
 		params.push('-DDetectVMInstallationsJob.disabled=true');
 	}