### Pre-submission Checklist #450
Description
Pre-submission Checklist
- I have checked that this question would not be more appropriate as an issue in a specific repository
- I have searched existing discussions and documentation for answers
Question Category
- Protocol Specification
- SDK Usage
- Server Implementation
- General Implementation
- Documentation
- Other
Your Question
Hi, just dipping my toes into this and have a couple of initial questions.
I'm trying to build a standalone MCP client (no Spring boot support). Here's my code so far:
HttpClientSseClientTransport transport = HttpClientSseClientTransport.builder(mcpFileLocation.getURI()).build();
McpSyncClient client = McpClient.sync(transport)
.requestTimeout(Duration.ofSeconds(30))
.capabilities(ClientCapabilities.builder()
.roots(true)
.sampling()
.build())
.build();
try {
client.initialize();
ListToolsResult tools = client.listTools();
ListPromptsResult prompts = client.listPrompts();
ListResourcesResult resources = client.listResources();
} catch (McpError e) {
SwingUtils.showError("Unable to contact server", e, this);
// this seems to get thrown if the URL is valid but times out,
// other errors seem to get swallowed in a separate thread.
}It seems that most low-level exceptions get logged and swallowed in separate threads, so what's the best way to catch them and feed them back to the UI?
Many thanks in advance!