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org.springframework.web.client.ResourceAccessException: I/O error: Connection timed out

Issue : In below code we are invoking external application through restTemplate exchange method.
What is happening is for starting few requests it is getting response and after that it is throwing org.springframework.web.client.ResourceAccessException: I/O error: Connection timed out exception.
Code:
resp = restTemplate.exchange(URL, HttpMethod.POST, request, Response.class);
Stack Trace :
org.springframework.web.client.ResourceAccessException: I/O error: Connection timed out (Connection timed out); nested exception is java.net.Connect
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:453)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:401)
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:377)
org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:689)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:90)

Java Soap web service connection: could not send Message

When I Try to connect a soap webservice with java, I take an exeption about like this
javax.xml.ws.WebServiceException: Could not send Message. at
org.apache.cxf.jaxws.JaxWsClientProxy.mapException(JaxWsClientProxy.java:183)
at
org.apache.cxf.jaxws.JaxWsClientProxy.invoke(JaxWsClientProxy.java:145)
at com.sun.proxy.$Proxy83.hastaHizmetVerileriGetir(Unknown Source)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
Method) at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.inte at
org.junit.vintage.engine.VintageTestEngine$$Lambda$361/0000000000000000.accept(Unknown
Source) at
java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:497)
at java.base/ja at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:763)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:463)
at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:209)
Caused by: org.apache.cxf.transport.http.HTTPException: HTTP response
'404: Not Found' when communicating with
url.example.com at
org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.doProcessResponseCode(HTTPConduit.java:1619)
at
org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponseInternal(HTTPConduit.java:1626)
at
org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.handleResponse(HTTPConduit.java:1571)
at
org.apache.cxf.transport.http.HTTPConduit$WrappedOutputStream.close(HTTPConduit.java:1371)
at
org.apache.cxf.transport.AbstractConduit.close(AbstractConduit.java:56)
at
org.apache.cxf.transport.http.HTTPConduit.close(HTTPConduit.java:671)
at
org.apache.cxf.interceptor.MessageSenderInterceptor$MessageSenderEndingInterceptor.handleMessage(MessageSenderInterceptor.java:63)
at
org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:308)
at org.apache.cxf.endpoint.ClientImpl.doInvoke(ClientImpl.java:530)
at org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:441) at
org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:356) at
org.apache.cxf.endpoint.ClientImpl.invoke(ClientImpl.java:314) at
org.apache.cxf.frontend.ClientProxy.invokeSync(ClientProxy.java:96)
at
org.apache.cxf.jaxws.JaxWsClientProxy.invoke(JaxWsClientProxy.java:140)
... 53 more
private IESHIstanbul getPort(CortexEvdeSaglikClientContext context,
String methodName) {
JaxWsProxyFactoryBean serviceProxyFactoryBean =
WsUtils.getServiceProxyFactoryBean(IESHIstanbul.class,
context.getUrl());
SoapLogInfo soapLogInfo = new SoapLogInfo();
soapLogInfo.setUrl(context.getUrl());
soapLogInfo.setMethodName(methodName);
soapHandlerService.getLoggingHandler(soapLogInfo);
Object port = serviceProxyFactoryBean.create();
WsUtils.setServiceEndPoint(port, context.getUrl());
return (IESHIstanbul) port; }
This about org.apache.cxf.transport.http.HTTPException: HTTP response
'404: Not Found'.
I have made some research about it but, I couldn't find any valuable solution.

Using keycloak api for a public client

Working on a project where there is a frontend (React) and a backend (Java/Quarkus). Keycloak is used as the auth tool. It is configured with a realm that has a public client on it. This allows the user to login via the browser and then make api requests to the backend with a bearer token attached to the request.
Running into a problem where we want to add users to our application. This means we also need to add them to keycloak. Doing this programatically, this is in its own mini module and it uses the keycloak-admin-client library.
I initiate the instance with
instance = KeycloakBuilder.builder()
.serverUrl(props.getProperty(PropertyConstants.SERVER_URL))
.realm(props.getProperty(PropertyConstants.REALM))
.grantType(OAuth2Constants.PASSWORD)
.clientId(props.getProperty(PropertyConstants.CLIENT_ID))
.username(props.getProperty(PropertyConstants.USERNAME))
.password(props.getProperty(PropertyConstants.PASSWORD))
.build();
realmResource = instance.realm(props.getProperty(PropertyConstants.REALM));
usersResource = realmResource.users();
UserRepresentation user = createUserRep();
Response response = usersResource.create(user);
The stacktrace is;
org.jboss.resteasy.spi.UnhandledException: javax.ws.rs.ProcessingException: RESTEASY004655: Unable to invoke request: javax.ws.rs.ProcessingException: RESTEASY003215: could not find writer for content-type application/x-www-form-urlencoded type: javax.ws.rs.core.Form$1
at org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:106)
at org.jboss.resteasy.core.ExceptionHandler.handleException(ExceptionHandler.java:372)
at org.jboss.resteasy.core.SynchronousDispatcher.writeException(SynchronousDispatcher.java:218)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:519)
at org.jboss.resteasy.core.SynchronousDispatcher.lambda$invoke$4(SynchronousDispatcher.java:261)
at org.jboss.resteasy.core.SynchronousDispatcher.lambda$preprocess$0(SynchronousDispatcher.java:161)
at org.jboss.resteasy.core.interception.jaxrs.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:364)
at org.jboss.resteasy.core.SynchronousDispatcher.preprocess(SynchronousDispatcher.java:164)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:247)
at io.quarkus.resteasy.runtime.standalone.RequestDispatcher.service(RequestDispatcher.java:73)
at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.dispatch(VertxRequestHandler.java:136)
at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler.access$000(VertxRequestHandler.java:40)
at io.quarkus.resteasy.runtime.standalone.VertxRequestHandler$1.run(VertxRequestHandler.java:97)
at io.quarkus.runtime.CleanableExecutor$CleaningRunnable.run(CleanableExecutor.java:231)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2046)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1578)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1452)
at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:29)
at org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:29)
at java.base/java.lang.Thread.run(Thread.java:829)
at org.jboss.threads.JBossThread.run(JBossThread.java:479)
Caused by: javax.ws.rs.ProcessingException: RESTEASY004655: Unable to invoke request: javax.ws.rs.ProcessingException: RESTEASY003215: could not find writer for content-type application/x-www-form-urlencoded type: javax.ws.rs.core.Form$1
at org.jboss.resteasy.client.jaxrs.engines.ManualClosingApacheHttpClient43Engine.invoke(ManualClosingApacheHttpClient43Engine.java:287)
at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.invoke(ClientInvocation.java:488)
at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientInvoker.invokeSync(ClientInvoker.java:149)
at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientInvoker.invoke(ClientInvoker.java:112)
at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientProxy.invoke(ClientProxy.java:76)
at com.sun.proxy.$Proxy89.grantToken(Unknown Source)
at org.keycloak.admin.client.token.TokenManager.grantToken(TokenManager.java:90)
at org.keycloak.admin.client.token.TokenManager.getAccessToken(TokenManager.java:70)
at org.keycloak.admin.client.token.TokenManager.getAccessTokenString(TokenManager.java:65)
at org.keycloak.admin.client.resource.BearerAuthFilter.filter(BearerAuthFilter.java:52)
at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.filterRequest(ClientInvocation.java:683)
at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.invoke(ClientInvocation.java:485)
at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientInvoker.invokeSync(ClientInvoker.java:149)
at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientInvoker.invoke(ClientInvoker.java:112)
at org.jboss.resteasy.client.jaxrs.internal.proxy.ClientProxy.invoke(ClientProxy.java:76)
at com.sun.proxy.$Proxy96.create(Unknown Source)
at com.demservices.KeycloakWrapper.addUser(KeycloakWrapper.java:56)
at com.demservices.services.UserService.addUser(UserService.java:27)
at com.demservices.services.UserService_Subclass.addUser$$superaccessor2(UserService_Subclass.zig:492)
at com.demservices.services.UserService_Subclass$$function$$2.apply(UserService_Subclass$$function$$2.zig:33)
at io.quarkus.arc.impl.AroundInvokeInvocationContext.proceed(AroundInvokeInvocationContext.java:54)
at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorBase.invokeInOurTx(TransactionalInterceptorBase.java:127)
at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorBase.invokeInOurTx(TransactionalInterceptorBase.java:100)
at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorRequired.doIntercept(TransactionalInterceptorRequired.java:32)
at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorBase.intercept(TransactionalInterceptorBase.java:53)
at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorRequired.intercept(TransactionalInterceptorRequired.java:26)
at io.quarkus.narayana.jta.runtime.interceptor.TransactionalInterceptorRequired_Bean.intercept(TransactionalInterceptorRequired_Bean.zig:340)
at io.quarkus.arc.impl.InterceptorInvocation.invoke(InterceptorInvocation.java:41)
at io.quarkus.arc.impl.AroundInvokeInvocationContext.perform(AroundInvokeInvocationContext.java:41)
at io.quarkus.arc.impl.InvocationContexts.performAroundInvoke(InvocationContexts.java:32)
at com.demservices.services.UserService_Subclass.addUser(UserService_Subclass.zig:440)
at com.demservices.services.UserService_ClientProxy.addUser(UserService_ClientProxy.zig:251)
at com.demservices.controllers.UserController.createNewUser(UserController.java:35)
at com.demservices.controllers.UserController_Subclass.createNewUser$$superaccessor1(UserController_Subclass.zig:234)
at com.demservices.controllers.UserController_Subclass$$function$$1.apply(UserController_Subclass$$function$$1.zig:33)
at io.quarkus.arc.impl.AroundInvokeInvocationContext.proceed(AroundInvokeInvocationContext.java:54)
at io.quarkus.hibernate.validator.runtime.interceptor.AbstractMethodValidationInterceptor.validateMethodInvocation(AbstractMethodValidationInterceptor.java:69)
at io.quarkus.hibernate.validator.runtime.jaxrs.JaxrsEndPointValidationInterceptor.validateMethodInvocation(JaxrsEndPointValidationInterceptor.java:35)
at io.quarkus.hibernate.validator.runtime.jaxrs.JaxrsEndPointValidationInterceptor_Bean.intercept(JaxrsEndPointValidationInterceptor_Bean.zig:392)
at io.quarkus.arc.impl.InterceptorInvocation.invoke(InterceptorInvocation.java:41)
at io.quarkus.arc.impl.AroundInvokeInvocationContext.perform(AroundInvokeInvocationContext.java:41)
at io.quarkus.arc.impl.InvocationContexts.performAroundInvoke(InvocationContexts.java:32)
at com.demservices.controllers.UserController_Subclass.createNewUser(UserController_Subclass.zig:191)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:170)
at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:130)
at org.jboss.resteasy.core.ResourceMethodInvoker.internalInvokeOnTarget(ResourceMethodInvoker.java:643)
at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTargetAfterFilter(ResourceMethodInvoker.java:507)
at org.jboss.resteasy.core.ResourceMethodInvoker.lambda$invokeOnTarget$2(ResourceMethodInvoker.java:457)
at org.jboss.resteasy.core.interception.jaxrs.PreMatchContainerRequestContext.filter(PreMatchContainerRequestContext.java:364)
at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:459)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:419)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:393)
at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:68)
at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:492)
... 20 more
Caused by: javax.ws.rs.ProcessingException: RESTEASY003215: could not find writer for content-type application/x-www-form-urlencoded type: javax.ws.rs.core.Form$1
at org.jboss.resteasy.core.interception.jaxrs.ClientWriterInterceptorContext.throwWriterNotFoundException(ClientWriterInterceptorContext.java:50)
at org.jboss.resteasy.core.interception.jaxrs.AbstractWriterInterceptorContext.getWriter(AbstractWriterInterceptorContext.java:302)
at org.jboss.resteasy.core.interception.jaxrs.AbstractWriterInterceptorContext.syncProceed(AbstractWriterInterceptorContext.java:240)
at org.jboss.resteasy.core.interception.jaxrs.AbstractWriterInterceptorContext.proceed(AbstractWriterInterceptorContext.java:224)
at org.jboss.resteasy.client.jaxrs.internal.ClientInvocation.writeRequestBody(ClientInvocation.java:440)
at org.jboss.resteasy.client.jaxrs.engines.ManualClosingApacheHttpClient43Engine.writeRequestBodyToOutputStream(ManualClosingApacheHttpClient43Engine.java:589)
at org.jboss.resteasy.client.jaxrs.engines.ManualClosingApacheHttpClient43Engine.buildEntity(ManualClosingApacheHttpClient43Engine.java:548)
at org.jboss.resteasy.client.jaxrs.engines.ManualClosingApacheHttpClient43Engine.loadHttpMethod(ManualClosingApacheHttpClient43Engine.java:455)
at org.jboss.resteasy.client.jaxrs.engines.ManualClosingApacheHttpClient43Engine.invoke(ManualClosingApacheHttpClient43Engine.java:265)
... 77 more
I see in any example that a clientSecret is required but that is for confidential clients. I don't want this, I need the client to be public.
How can I have a public client while also being able to make API calls to it?

java.io.IOException: Premature EOF at com.sun.jersey.api.client.ClientResponse.getEntity

I'm facing with the exception com.sun.jersey.api.client.ClientHandlerException due to a java.io.IOException: Premature EOF when I'm posting data to a API's endpoint and getting the response as bellow:
response = client.resource(this.url)
.type(MediaType.APPLICATION_JSON)
.accept(MediaType.APPLICATION_JSON_TYPE)
.header("Accept", "application/json")
.post(ClientResponse.class, payloadToBeRequested);
JSONObject responseObj = new JSONObject(response.getEntity(String.class));
The exactly stack trace for that exception pointed to the line where the method getEntity is called is:
com.sun.jersey.api.client.ClientHandlerException: java.io.IOException: Premature EOF
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:563)
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:506)
at BlockstemRequester.lambda$run$0(BlockstemRequester.java:51)
at java.lang.Iterable.forEach(Iterable.java:75)
at java.util.Collections$SynchronizedCollection.forEach(Collections.java:2062)
at BlockstemRequester.run(BlockstemRequester.java:29)
Caused by: java.io.IOException: Premature EOF
at sun.net.www.http.ChunkedInputStream.readAheadBlocking(ChunkedInputStream.java:565)
at sun.net.www.http.ChunkedInputStream.readAhead(ChunkedInputStream.java:609)
at sun.net.www.http.ChunkedInputStream.read(ChunkedInputStream.java:696)
at java.io.FilterInputStream.read(FilterInputStream.java:133)
at sun.net.www.protocol.http.HttpURLConnection$HttpInputStream.read(HttpURLConnection.java:3335)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.Reader.read(Reader.java:140)
at com.sun.jersey.core.util.ReaderWriter.readFromAsString(ReaderWriter.java:171)
at com.sun.jersey.core.util.ReaderWriter.readFromAsString(ReaderWriter.java:157)
at com.sun.jersey.core.provider.AbstractMessageReaderWriterProvider.readFromAsString(AbstractMessageReaderWriterProvider.java:114)
at com.sun.jersey.core.impl.provider.entity.StringProvider.readFrom(StringProvider.java:73)
at com.sun.jersey.core.impl.provider.entity.StringProvider.readFrom(StringProvider.java:58)
at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:553)
... 5 more
I have tried some solutions reading across some questions here but I have gotten no clue about that. So, what could be the possible problems that might raise this Premature EOF when getting the Entity from a POST request?
Thank you.

URISyntax exception while sending HTTP request to Solr from Java play framework

I am getting URISyntaxException when I make an HTTP request using the WS.url() API of play framework in java.
Below is the stack trace of the excetption.
play.api.Application$$anon$1: Execution exception[[IllegalArgumentException: null]]
at play.api.Application$class.handleError(Application.scala:293) ~[play_2.10.jar:2.2.0]
at play.api.DefaultApplication.handleError(Application.scala:399) [play_2.10.jar:2.2.0]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$2$$anonfun$applyOrElse$3.apply(PlayDefaultUpstreamHandler.scala:261) [play_2.10.jar:2.2.0]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$2$$anonfun$applyOrElse$3.apply(PlayDefaultUpstreamHandler.scala:261) [play_2.10.jar:2.2.0]
at scala.Option.map(Option.scala:145) [scala-library.jar:na]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$2.applyOrElse(PlayDefaultUpstreamHandler.scala:261) [play_2.10.jar:2.2.0]
Caused by: java.lang.IllegalArgumentException: null
at java.net.URI.create(URI.java:841) ~[na:1.6.0_65]
at com.ning.http.client.RequestBuilderBase.buildURI(RequestBuilderBase.java:390) ~[async-http-client.jar:na]
at com.ning.http.client.RequestBuilderBase.setUrl(RequestBuilderBase.java:373) ~[async-http-client.jar:na]
at play.libs.WS$WSRequest.setUrl(WS.java:137) ~[play-java_2.10.jar:2.2.0]
at play.libs.WS$WSRequestHolder.execute(WS.java:454) ~[play-java_2.10.jar:2.2.0]
at play.libs.WS$WSRequestHolder.get(WS.java:352) ~[play-java_2.10.jar:2.2.0]
Caused by: java.net.URISyntaxException: Illegal character in query at index 419: http://solrUrl.com/solr/catalog/select?facet=true&fl=identifier_ntk,catgroup_id,name,shortDescription,thumbnail,sequence,parentCatgroup_id_facet,childCatgroup_id,storeent_id,childCatentry_id&debugQuery=false&start=0&q=*:*&timeAllowed=15000&json.nl=map&wt=json&fq=storeent_id:(%2210001%22)&fq=catalog_id:%2210001%22&fq=parentCatgroup_id_facet:(+10001_\-1)&version=2&rows=50
at java.net.URI$Parser.fail(URI.java:2810) ~[na:1.6.0_65]
at java.net.URI$Parser.checkChars(URI.java:2983) ~[na:1.6.0_65]
at java.net.URI$Parser.parseHierarchical(URI.java:3073) ~[na:1.6.0_65]
at java.net.URI$Parser.parse(URI.java:3015) ~[na:1.6.0_65]
at java.net.URI.<init>(URI.java:577) ~[na:1.6.0_65]
at java.net.URI.create(URI.java:839) ~[na:1.6.0_65]
Can you help me resolve this?

This does not seem to be a Solr problem:
Caused by: java.net.URISyntaxException: Illegal character in query at index 419:
http://solrUrl.com/solr/catalog/select?facet=true&fl=identifier_ntk,catgroup_id,.....
at java.net.URI$Parser.fail(URI.java:2810) ~[na:1.6.0_65]
at java.net.URI$Parser.checkChars(URI.java:2983) ~[na:1.6.0_65]
at java.net.URI$Parser.parseHierarchical(URI.java:3073) ~[na:1.6.0_65]
Looks like the URL might be mis-shaped on the play side. The index seem to be pointing at the last or one after last character. I would print that URL before trying to open it and see if there is something funny in it. Like having a wrong newline at the end of the URL or something similar.