Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via Spring JIRA by Roy Clarkson, 1 year ago
I/O error: Received authentication challenge is null; nested exception is java.io.IOException: Received authentication challenge is null
via Spring JIRA by Roy Clarkson, 2 years ago
I/O error: Received authentication challenge is null; nested exception is java.io.IOException: Received authentication challenge is null
via Stack Overflow by Sam
, 1 year ago
I/O error on GET request for "https://URL_To_Connect_With_External_System": connect timed out; nested exception is java.net.SocketTimeoutException: connect timed out
via Stack Overflow by Anton Chertash
, 1 year ago
I/O error on GET request for "https://graph.facebook.com/v2.8/me": java.security.NoSuchAlgorithmException: Error constructing implementation (algorithm: Default, provider: SunJSSE, class: sun.security.ssl.SSLContextImpl$DefaultSSLContext); nested
via Stack Overflow by user3392627
, 1 year ago
I/O error on GET request for "localhost:8034/v1/users/81ebc4ca-2496-4cc3-b533-311f237b6fe9/crop_details/10/summary": Read timed out; nested exception is java.net.SocketTimeoutException: Read timed out
via Stack Overflow by Miguel Costa
, 1 month ago
I/O error on POST request for "https://graph.facebook.com/v2.5/oauth/access_token": http://proxy.sys.net; nested exception is java.net.UnknownHostException: http://proxy.sys.net
org.springframework.web.client.ResourceAccessException: I/O error: Received authentication challenge is null; nested exception is java.io.IOException: Received authentication challenge is null at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:471) at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:419) at org.springframework.web.client.RestTemplate.getForEntity(RestTemplate.java:239) at org.springframework.web.client.AbstractRestTemplateIntegrationTests.testGetEntityNotAuthorized(AbstractRestTemplateIntegrationTests.java:128) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:507) at junit.framework.TestCase.runTest(TestCase.java:154) at junit.framework.TestCase.runBare(TestCase.java:127) at junit.framework.TestResult$1.protect(TestResult.java:106) at junit.framework.TestResult.runProtected(TestResult.java:124) at junit.framework.TestResult.run(TestResult.java:109) at junit.framework.TestCase.run(TestCase.java:118) at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169) at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154) at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:529) at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1448)Caused by: java.io.IOException: Received authentication challenge is null at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.processAuthHeader(HttpURLConnectionImpl.java:1153) at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.processResponseHeaders(HttpURLConnectionImpl.java:1095) at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.retrieveResponse(HttpURLConnectionImpl.java:1048) at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getResponseCode(HttpURLConnectionImpl.java:726) at org.springframework.http.client.SimpleClientHttpResponse.getStatusCode(SimpleClientHttpResponse.java:49) at org.springframework.web.client.DefaultResponseErrorHandler.hasError(DefaultResponseErrorHandler.java:46) at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:457) ... 15 more