Update to Java 11

- Bump to 0.30.0-SNPASHOT, since updating to Java 11 breaks API
- Use `--release 11` in maven compiler plugin
- Use Java 11 in the Jenkinsfiles
- Use Java 11 in the GitHub Actions
- Update tycho to 2.7.5 (the newest version that supports Java 11)
- Update to the latest lsp4j, adapt to the API changes, and remove the
  guava exclusion (lsp4j no longer ships with guava, so we don't need to
  exclude it)

Signed-off-by: David Thompson <[email protected]>

.github/workflows/pr-verify.yml

@@ -18,12 +18,12 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
-    - name: Check out code 
+    - name: Check out code
       uses: actions/checkout@v4
-    - name: Set up JDK 8
+    - name: Set up JDK 11
       uses: actions/setup-java@v4
       with:
-        java-version: '8'
+        java-version: '11'
         distribution: 'temurin'
         architecture: ${{ matrix.os == 'macos-latest' && 'x64' || '' }}
         cache: 'maven'

Jenkinsfile

@@ -1,7 +1,7 @@
 pipeline{
   agent any
   tools {
-    jdk 'adoptopenjdk-hotspot-jdk8-latest'
+    jdk 'adoptopenjdk-hotspot-jdk11-latest'
   }
   environment {
     MAVEN_HOME = "$WORKSPACE/.m2/"

Release.jenkins

@@ -1,7 +1,7 @@
 pipeline{
   agent any
   tools {
-    jdk 'adoptopenjdk-hotspot-jdk8-latest'
+    jdk 'adoptopenjdk-hotspot-jdk11-latest'
   }
   environment {
     MAVEN_HOME = "$WORKSPACE/.m2/"

org.eclipse.lemminx/pom.xml

@@ -3,7 +3,7 @@
 	<parent>
 		<groupId>org.eclipse.lemminx</groupId>
 		<artifactId>lemminx-parent</artifactId>
-		<version>0.29.1-SNAPSHOT</version>
+		<version>0.30.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>org.eclipse.lemminx</artifactId>
 	<properties>
@@ -217,12 +217,6 @@
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
 			<artifactId>org.eclipse.lsp4j</artifactId>
-			<exclusions>
-				<exclusion>
-					<groupId>com.google.guava</groupId>
-					<artifactId>guava</artifactId>
-				</exclusion>
-			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.eclipse.lsp4j</groupId>
@@ -291,8 +285,8 @@
 		<dependency>
 			<groupId>org.eclipse.jetty</groupId>
 			<artifactId>jetty-server</artifactId>
-			<!-- Need to stick to 9.x as long as build is running with Java 1.8-->
-			<version>9.4.53.v20231009</version>
+			<!-- Need to stick to 11.x as long as build is running with Java 11. It's EOL but only used in tests -->
+			<version>11.0.24</version>
 			<scope>test</scope>
 		</dependency>
 	</dependencies>

org.eclipse.lemminx/src/main/java/org/eclipse/lemminx/client/CodeLensKindCapabilities.java

@@ -13,11 +13,11 @@
 
 import java.util.List;
 
-import org.eclipse.lemminx.utils.ToStringBuilder;
+import org.eclipse.lsp4j.jsonrpc.util.ToStringBuilder;
 
 /**
  * Specific capabilities for the `CodeLensKind`.
- * 
+ *
  * @see https://github.com/microsoft/language-server-protocol/issues/788
  */
 @SuppressWarnings("all")
@@ -26,7 +26,7 @@ public class CodeLensKindCapabilities {
 	 * The codeLens kind values the client supports. When this property exists the
 	 * client also guarantees that it will handle values outside its set gracefully
 	 * and falls back to a default value when unknown.
-	 * 
+	 *
 	 * If this property is not present the client only supports the codeLens kinds
 	 * from `File` to `Array` as defined in the initial version of the protocol.
 	 */
@@ -43,7 +43,7 @@ public CodeLensKindCapabilities(final List<String> valueSet) {
 	 * The codeLens kind values the client supports. When this property exists the
 	 * client also guarantees that it will handle values outside its set gracefully
 	 * and falls back to a default value when unknown.
-	 * 
+	 *
 	 * If this property is not present the client only supports the codeLens kinds
 	 * from `File` to `Array` as defined in the initial version of the protocol.
 	 */
@@ -55,7 +55,7 @@ public List<String> getValueSet() {
 	 * The codeLens kind values the client supports. When this property exists the
 	 * client also guarantees that it will handle values outside its set gracefully
 	 * and falls back to a default value when unknown.
-	 * 
+	 *
 	 * If this property is not present the client only supports the codeLens kinds
 	 * from `File` to `Array` as defined in the initial version of the protocol.
 	 */

org.eclipse.lemminx/src/main/java/org/eclipse/lemminx/client/ExtendedCodeLensCapabilities.java

@@ -11,15 +11,15 @@
 *******************************************************************************/
 package org.eclipse.lemminx.client;
 
-import org.eclipse.lemminx.utils.ToStringBuilder;
+import org.eclipse.lsp4j.jsonrpc.util.ToStringBuilder;
 import org.eclipse.lsp4j.DynamicRegistrationCapabilities;
 
 /**
- * Extended capabilities specific to the `textDocument/codeLens` request. This capability doesn't belong to LSP specification. See proposal at 
+ * Extended capabilities specific to the `textDocument/codeLens` request. This capability doesn't belong to LSP specification. See proposal at
  * https://github.com/microsoft/language-server-protocol/issues/788
- * 
+ *
  * @author Angelo ZERR
- * 
+ *
  * @see https://github.com/microsoft/language-server-protocol/issues/788
  */
 @SuppressWarnings("all")