AutoConfigure simple language server

It is @ConditionalOnMissingBean so actually this doesn't do anything yet
because  all our language servers still create a SimpleLanguageServer
bean manually.

headless-services/commons/commons-language-server/src/main/java/org/springframework/ide/vscode/commons/languageserver/config/LanguageServerProperties.java

@@ -17,6 +17,14 @@ public class LanguageServerProperties {
 	 */
 	private int standalonePort = 5007;
 
+	/**
+	 * Extension id is a unique identifier associated with a type of language server.
+	 * It is used to derive furether unique ids that should be 'scoped' to a particular
+	 * language server. For example ids for vscode comands used to define code actions
+	 * are derived by appending command names with this id.
+	 */
+	private String extensionId;
+
 	public boolean isStandalone() {
 		return standalone;
 	}
@@ -32,4 +40,13 @@ public class LanguageServerProperties {
 	public void setStandalonePort(int standalonePort) {
 		this.standalonePort = standalonePort;
 	}
+
+	public String getExtensionId() {
+		return extensionId;
+	}
+
+	public void setExtensionId(String extensionId) {
+		this.extensionId = extensionId;
+	}
+
 }

headless-services/commons/commons-language-server/src/main/java/org/springframework/ide/vscode/commons/languageserver/util/SimpleLanguageServer.java

@@ -183,6 +183,7 @@ public class SimpleLanguageServer implements Sts4LanguageServer, LanguageClientA
 	}
 
 	public SimpleLanguageServer(String extensionId) {
+		Assert.isNotNull(extensionId);
 		this.EXTENSION_ID = extensionId;
 		this.CODE_ACTION_COMMAND_ID = "sts."+EXTENSION_ID+".codeAction";
 	}

headless-services/commons/language-server-starter/src/main/java/org/springframework/ide/vscode/languageserver/starter/LanguageServerAutoconf.java

@@ -10,9 +10,8 @@
  *******************************************************************************/
 package org.springframework.ide.vscode.languageserver.starter;
 
-import javax.inject.Provider;
-
 import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
@@ -32,4 +31,9 @@ public class LanguageServerAutoconf {
 		return new LanguageServerRunner(serverName, properties, languageServerFactory);
 	}
 	
+	@ConditionalOnMissingBean
+	@Bean public SimpleLanguageServer languageServer(LanguageServerProperties props) {
+		return new SimpleLanguageServer(props.getExtensionId());
+	}
+	
 }