Constructor init of java.lsp.server JavaPlatformProvider override

1. Allowed LspJavaPlatformProviderOverride to initialize the override
   based on the value set for the option "netbeans.lsp.java.platform.override"
   passed as a JVM system property.

2. Utilised platform override system property in Java VSCode extension
    1. From the Java VSCode extension, passed the value of
       "jdk.project.jdkhome" configuration to the NBLS via the JVM
       system property flag "netbeans.lsp.java.platform.override".
    2. This additionally allows the LspJavaPlatformProviderOverride to initialize
       the JavaPlatform override during construction, avoiding any caching
       of the default platform prior to the configuration being read via LSP.

Author: sid-srini

build.xml

@@ -64,6 +64,7 @@
             patches/8460-draft.diff
             patches/8470.diff
             patches/8484.diff
+            patches/8745-draft.diff
             patches/disable-error-notification.diff
             patches/mvn-sh.diff
             patches/project-marker-jdk.diff

nbcode/integration/src/org/netbeans/modules/nbcode/integration/LspJavaPlatformProviderOverride.java

@@ -28,4 +28,8 @@
  */
 @ServiceProvider(service = JavaPlatformProvider.class, position = 10_000)
 public class LspJavaPlatformProviderOverride extends AbstractJavaPlatformProviderOverride {
+
+    public LspJavaPlatformProviderOverride() {
+        super(System.getProperty("netbeans.lsp.java.platform.override", null)); //NOI18N
+    }
 }

patches/8745-draft.diff

@@ -0,0 +1,19 @@
+diff --git a/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/ui/AbstractJavaPlatformProviderOverride.java b/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/ui/AbstractJavaPlatformProviderOverride.java
+index df668954dd..054f85d0e5 100644
+--- a/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/ui/AbstractJavaPlatformProviderOverride.java
++++ b/java/java.lsp.server/src/org/netbeans/modules/java/lsp/server/ui/AbstractJavaPlatformProviderOverride.java
+@@ -39,6 +39,14 @@ public abstract class AbstractJavaPlatformProviderOverride implements JavaPlatfo
+     private final PropertyChangeSupport pcs = new PropertyChangeSupport(this);
+     private FileObject defaultPlatformOverride;
+ 
++    public AbstractJavaPlatformProviderOverride() {
++        this(null);
++    }
++
++    protected AbstractJavaPlatformProviderOverride(String defaultPlatformOverride) {
++        this.defaultPlatformOverride = defaultPlatformOverride == null ? null : FileUtil.toFileObject(new File(defaultPlatformOverride));
++    }
++
+     @Override
+     @SuppressWarnings("ReturnOfCollectionOrArrayField")
+     public JavaPlatform[] getInstalledPlatforms() {

vscode/src/configurations/handlers.ts

@@ -55,6 +55,10 @@ export const jdkHomeValueHandler = (): string | null => {
         null;
 }
 
+export const projectJdkHomeValueHandler = (): string | null => {
+    return getConfigurationValue(configKeys.projectJdkHome, null);
+}
+
 export const projectSearchRootsValueHandler = (): string => {
     let projectSearchRoots: string = '';
     const isProjectFolderSearchLimited: boolean = !getConfigurationValue(configKeys.disableProjSearchLimit, false);

vscode/src/lsp/launchOptions.ts

@@ -14,7 +14,7 @@
   limitations under the License.
 */
 import { builtInConfigKeys, configKeys } from "../configurations/configuration"
-import { isDarkColorThemeHandler, isNetbeansVerboseEnabled, jdkHomeValueHandler, lspServerVmOptionsHandler, projectSearchRootsValueHandler, userdirHandler } from "../configurations/handlers";
+import { isDarkColorThemeHandler, isNetbeansVerboseEnabled, jdkHomeValueHandler, projectJdkHomeValueHandler, lspServerVmOptionsHandler, projectSearchRootsValueHandler, userdirHandler } from "../configurations/handlers";
 import { l10n } from "../localiser";
 import { isString } from "../utils";
 import { userDefinedLaunchOptionsType } from "./types"
@@ -25,6 +25,10 @@ export const getUserConfigLaunchOptionsDefaults = (): userDefinedLaunchOptionsTy
             value: jdkHomeValueHandler(),
             optionToPass: ['--jdkhome']
         },
+        [configKeys.projectJdkHome]: {
+            value: projectJdkHomeValueHandler(),
+            optionToPass: '-J-Dnetbeans.lsp.java.platform.override='
+        }, 
         [configKeys.userdir]: {
             value: userdirHandler(),
             optionToPass: ['--userdir']