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Fix misleading NPE when request parameter is not Serializable #16299

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Fix misleading NPE when request parameter is not Serializable #16299

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6a87012
Fix misleading NPE when request parameter is not Serializable
chensishang May 31, 2026
9bc0d46
Merge branch '3.3' into fix-16293-misleading-npe
chensishang Jun 1, 2026
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8 changes: 8 additions & 0 deletions ...-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DubboProtocol.java
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Original file line number Diff line number Diff line change
Expand Up @@ -290,6 +290,14 @@ Invoker<?> getInvoker(Channel channel, Invocation inv) throws RemotingException
boolean isStubServiceInvoke;
int port = channel.getLocalAddress().getPort();
String path = (String) inv.getObjectAttachmentWithoutConvert(PATH_KEY);
if (path == null) {
throw new RemotingException(
channel,
"Failed to resolve service path from invocation. "
+ "This may be caused by non-serializable request parameters. "
+ "Please ensure all parameter types implement java.io.Serializable, "
+ "channel: " + channel.getRemoteAddress() + " --> " + channel.getLocalAddress());
}

// if it's stub service on client side(after enable stubevent, usually is set up onconnect or ondisconnect
// method)
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18 changes: 18 additions & 0 deletions .../dubbo-rpc-dubbo/src/test/java/org/apache/dubbo/rpc/protocol/dubbo/DubboProtocolTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,8 @@
import org.apache.dubbo.common.URL;
import org.apache.dubbo.common.extension.ExtensionLoader;
import org.apache.dubbo.common.utils.NetUtils;
import org.apache.dubbo.remoting.Channel;
import org.apache.dubbo.remoting.RemotingException;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Protocol;
Expand All @@ -38,6 +40,7 @@
import org.apache.dubbo.rpc.protocol.dubbo.support.Type;
import org.apache.dubbo.rpc.service.EchoService;

import java.net.InetSocketAddress;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
Expand Down Expand Up @@ -281,6 +284,21 @@ public void testReturnNonSerialized() {
}
}

@Test
void testGetInvokerThrowsOnNullPath() {
DubboProtocol dubboProtocol = DubboProtocol.getDubboProtocol();
Channel channel = Mockito.mock(Channel.class);
InetSocketAddress localAddress = new InetSocketAddress("127.0.0.1", 20880);
InetSocketAddress remoteAddress = new InetSocketAddress("127.0.0.1", 12345);
Mockito.when(channel.getLocalAddress()).thenReturn(localAddress);
Mockito.when(channel.getRemoteAddress()).thenReturn(remoteAddress);

Invocation inv = Mockito.mock(Invocation.class);
Mockito.when(inv.getObjectAttachmentWithoutConvert("path")).thenReturn(null);

Assertions.assertThrows(RemotingException.class, () -> dubboProtocol.getInvoker(channel, inv));
}

@Disabled
@Test
void testRemoteApplicationName() throws Exception {
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