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[fix] when mcp server not give mcp session id ,mcp session store null… #554

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[fix] when mcp server not give mcp session id ,mcp session store null… #554

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772c795
[fix] when mcp server not give mcp session id ,mcp session store null…
Sep 16, 2025
eb31fed
[fix] when mcp server not give mcp session id ,
Sep 17, 2025
8e97e26
[fix] when mcp server not give mcp session id ,
Sep 17, 2025
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5 changes: 3 additions & 2 deletions .../main/java/io/modelcontextprotocol/client/transport/WebClientStreamableHttpTransport.java
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.codec.ServerSentEvent;
import org.springframework.util.StringUtils;
import org.springframework.web.reactive.function.client.ClientResponse;
import org.springframework.web.reactive.function.client.WebClient;
import org.springframework.web.reactive.function.client.WebClientResponseException;
Expand Down Expand Up @@ -279,8 +280,8 @@ public Mono<Void> sendMessage(McpSchema.JSONRPCMessage message) {
})
.bodyValue(message)
.exchangeToFlux(response -> {
if (transportSession
.markInitialized(response.headers().asHttpHeaders().getFirst(HttpHeaders.MCP_SESSION_ID))) {
String mcpSessionId = response.headers().asHttpHeaders().getFirst(HttpHeaders.MCP_SESSION_ID);
if (StringUtils.hasText(mcpSessionId) && transportSession.markInitialized(mcpSessionId)) {
// Once we have a session, we try to open an async stream for
// the server to send notifications and requests out-of-band.
reconnect(null).contextWrite(sink.contextView()).subscribe();
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5 changes: 3 additions & 2 deletions ...main/java/io/modelcontextprotocol/client/transport/HttpClientStreamableHttpTransport.java
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,7 @@
import java.net.http.HttpResponse.BodyHandler;
import java.time.Duration;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.CompletionException;
import java.util.concurrent.atomic.AtomicReference;
Expand Down Expand Up @@ -442,8 +443,8 @@ public Mono<Void> sendMessage(McpSchema.JSONRPCMessage sentMessage) {
})).onErrorMap(CompletionException.class, t -> t.getCause()).onErrorComplete().subscribe();

})).flatMap(responseEvent -> {
if (transportSession.markInitialized(
responseEvent.responseInfo().headers().firstValue("mcp-session-id").orElseGet(() -> null))) {
String mcpSessionId = responseEvent.responseInfo().headers().firstValue("mcp-session-id").orElseGet(() -> null);
if (Objects.nonNull(mcpSessionId) && transportSession.markInitialized(mcpSessionId)) {
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API Note:
This method exists to be used as a java.util.function.Predicate, filter(Objects::nonNull)

I think mcpSessionId != null should be used here.

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Oh, I see. It is used to listen for notifications. thx!

// Once we have a session, we try to open an async stream for
// the server to send notifications and requests out-of-band.

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