Fix compilation issue on recent lsp4e

I also beleave the new api that's being overridden here has something to do
with how the error ouput from LSP process might be shown to the user.

eclipse-language-servers/org.springframework.tooling.boot.java.ls/src/org/springframework/tooling/boot/java/ls/DelegatingStreamConnectionProvider.java

@@ -55,7 +55,6 @@ public class DelegatingStreamConnectionProvider implements StreamConnectionProvi
 	
 	public DelegatingStreamConnectionProvider() {
 		String port = System.getProperty("boot-java-ls-port");
-		
 		if (port != null) {
 			this.provider = new SpringBootJavaLanguageServerViaSocket(Integer.parseInt(port));
 		}
@@ -125,5 +124,8 @@ public class DelegatingStreamConnectionProvider implements StreamConnectionProvi
 		settings.put("boot-java", bootJavaObj);
 		this.languageServer.getWorkspaceService().didChangeConfiguration(new DidChangeConfigurationParams(settings));
 	}
-	
+
+	public InputStream getErrorStream() {
+		return provider.getErrorStream();
+	}
 }

eclipse-language-servers/org.springframework.tooling.boot.java.ls/src/org/springframework/tooling/boot/java/ls/SpringBootJavaLanguageServerViaSocket.java

@@ -61,4 +61,9 @@ public class SpringBootJavaLanguageServerViaSocket implements StreamConnectionPr
 		}
 	}
 
+	public InputStream getErrorStream() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+
 }