# Elastic APM java agent could not connect to APM server **URL:** \ **Category:** APM\ **Tags:** java, server\ **Created:** [February 8, 2022, 5:14pm UTC](https://discuss.elastic.co/t/elastic-apm-java-agent-could-not-connect-to-apm-server/296642 "2022-02-08T17:14:43Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![ramm](https://avatars.discourse-cdn.com/v4/letter/r/b2d939/32.png) [@ramm](https://discuss.elastic.co/u/ramm)\ **Post date:** [February 8, 2022, 5:14pm UTC](https://discuss.elastic.co/t/elastic-apm-java-agent-could-not-connect-to-apm-server/296642/1 "2022-02-08T17:14:44Z")
Our Java agent could not connect to APM server, seeing the following error 2022-02-08 12:13:32,519 [elastic-apm-shared] DEBUG co.elastic.apm.agent.report.ApmServerReporter - Could not add JsonWriter {"metricset":{"timestamp":1644340412519000,"tags":{"name":"scavenge"},"samples":{"jvm.gc.time":{"value":14563.0},"jvm.gc.count":{"value":64.0}}}} to ring buffer as no slots are available 2022-02-08 12:13:32,519 [elastic-apm-shared] DEBUG co.elastic.apm.agent.report.ApmServerReporter - Could not add JsonWriter {"metricset":{"timestamp":1644340412519000,"tags":{"name":"nursery-survivor"},"samples":{"jvm.memory.heap.pool.committed":{"value":433651712.0},"jvm.memory.heap.pool.max":{"value":590774272.0},"jvm.memory.heap.pool.used":{"value":433651712.0}}}} to ring buffer as no slots are available 2022-02-08 12:13:32,535 [elastic-apm-shared] DEBUG co.elastic.apm.agent.report.ApmServerReporter - Could not add JsonWriter {"metricset":{"timestamp":1644340412519000,"samples":{"system.process.cpu.total.norm.pct":{"value":0.008072681213464607},"jvm.memory.heap.used":{"value":4257639384.0},"jvm.memory.non\_heap.used":{"value":625746132.0},"jvm.memory.heap.max":{"value":17179869184.0},"jvm.memory.non\_heap.committed":{"value":993469124.0},"system.cpu.total.norm.pct":{"value":0.13332427928152732},"system.process.memory.size":{"value":7151595520.0},"jvm.memory.heap.committed":{"value":6026297344.0},"jvm.memory.non\_heap.max":{"value":-1.0},"system.memory.actual.free":{"value":11020980224.0},"system.memory.total":{"value":25769332736.0},"jvm.thread.count":{"value":270.0}}}} to ring buffer as no slots are available 2022-02-08 12:13:32,535 [elastic-apm-shared] DEBUG co.elastic.apm.agent.report.ApmServerReporter - Could not add JsonWriter {"metricset":{"timestamp":1644340412535000,"transaction":{"name":"LeadServicesApi#retrieveLead","type":"request"},"span":{"type":"app","subtype":null},"tags":{},"samples":{"span.self\_time.count":{"value":3},"span.self\_time.sum.us":{"value":12273}}}} to ring buffer as no slots are available 2022-02-08 12:13:32,535 [elastic-apm-shared] DEBUG co.elastic.apm.agent.report.ApmServerReporter - Could not add JsonWriter {"metricset":{"timestamp":1644340412535000,"transaction":{"name":"HealthCheckApi#getProdConfigStatus","type":"request"},"span":{"type":"app","subtype":null},"tags":{},"samples":{"span.self\_time.count":{"value":3},"span.self\_time.sum.us":{"value":6718}}}} to ring buffer as no slots are available 2022-02-08 12:13:32,535 [elastic-apm-shared] DEBUG co.elastic.apm.agent.report.ApmServerReporter - Could not add JsonWriter {"metricset":{"timestamp":1644340412535000,"transaction":{"name":"FormContentRestApi#getFormContentByName","type":"request"},"span":{"type":"app","subtype":null},"tags":{},"samples":{"span.self\_time.count":{"value":3},"span.self\_time.sum.us":{"value":14679}}}} to ring buffer as no slots are available 2022-02-08 12:13:32,535 [elastic-apm-shared] DEBUG co.elastic.apm.agent.report.ApmServerReporter - Could not add JsonWriter {"metricset":{"timestamp":1644340412535000,"tags":{"name":"tenured-LOA"},"samples":{"jvm.memory.heap.pool.committed":{"value":143681536.0},"jvm.memory.heap.pool.max":{"value":832150528.0},"jvm.memory.heap.pool.used":{"value":0.0}}}} to ring buffer as no slots are available 2022-02-08 12:13:32,535 [elastic-apm-shared] DEBUG co.elastic.apm.agent.report.ApmServerReporter - Could not add JsonWriter {"metricset":{"timestamp":1644340412535000,"tags":{"name":"tenured-SOA"},"samples":{"jvm.memory.heap.pool.committed":{"value":2729940992.0},"jvm.memory.heap.pool.max":{"value":15810847744.0},"jvm.memory.heap.pool.used":{"value":2091991704.0}}}} to ring buffer as no slots are available 2022-02-08 12:13:32,535 [elastic-apm-shared] DEBUG co.elastic.apm.agent.report.ApmServerReporter - Could not add JsonWriter {"metricset":{"timestamp":1644340412535000,"tags":{"name":"nursery-allocate"},"samples":{"jvm.memory.heap.pool.committed":{"value":2719023104.0},"jvm.memory.heap.pool.max":{"value":3704193024.0},"jvm.memory.heap.pool.used":{"value":1732073792.0}}}} to ring buffer as no slots are available 2022-02-08 12:13:32,535 [elastic-apm-shared] DEBUG co.elastic.apm.agent.report.ApmServerReporter - Could not add JsonWriter {"metricset":{"timestamp":1644340412535000,"tags":{"name":"global"},"samples":{"jvm.gc.time":{"value":5148.0},"jvm.gc.count":{"value":8.0}}}} to ring buffer as no slots are available 2022-02-08 12:13:32,535 [elastic-apm-shared] DEBUG co.elastic.apm.agent.report.ApmServerReporter - Could not add JsonWriter {"metricset":{"timestamp":1644340412535000,"transaction":{"name":"HealthCheck#checkServicesState","type":"request"},"span":{"type":"app","subtype":null},"tags":{},"samples":{"span.self\_time.count":{"value":3},"span.self\_time.sum.us":{"value":2283426}}}} to ring buffer as no slots are available 2022-02-08 12:13:34,303 [elastic-apm-server-reporter] ERROR co.elastic.apm.agent.report.IntakeV2ReportingEventHandler - Error trying to connect to APM Server at [http://xxxxxxx:8200/intake/v2/events](http://xxxxxxx:8200/intake/v2/events). Some details about SSL configurations corresponding the current connection are logged at INFO level. 2022-02-08 12:13:34,303 [elastic-apm-server-reporter] ERROR co.elastic.apm.agent.report.IntakeV2ReportingEventHandler - Failed to handle event of type JSON\_WRITER with this error: connect timed out 2022-02-08 12:13:34,303 [elastic-apm-server-reporter] DEBUG co.elastic.apm.agent.report.IntakeV2ReportingEventHandler - Event handling failure java.net.SocketTimeoutException: connect timed out at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:236) ~[?:1.8.0] at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:218) ~[?:1.8.0] at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183) ~[?:1.8.0] at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:403) ~[?:1.8.0] at java.net.Socket.connect(Socket.java:682) ~[?:1.8.0] at sun.net.NetworkClient.doConnect(NetworkClient.java:187) ~[?:1.8.0] at sun.net.www.http.HttpClient.openServer(HttpClient.java:494) ~[?:1.8.0] at sun.net.www.http.HttpClient.openServer(HttpClient.java:589) ~[?:1.8.0] at sun.net.www.http.HttpClient.(HttpClient.java:256) ~[?:1.8.0] at sun.net.www.http.HttpClient.New(HttpClient.java:360) ~[?:1.8.0] at sun.net.www.http.HttpClient.New(HttpClient.java:378) ~[?:1.8.0] at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:1238) ~[?:1.8.0] at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(HttpURLConnection.java:1174) ~[?:1.8.0] at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:1068) ~[?:1.8.0] at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:1002) ~[?:1.8.0] at co.elastic.apm.agent.report.AbstractIntakeApiHandler.startRequest(AbstractIntakeApiHandler.java:113) ~[elastic-apm-agent-1.28.4.jar:?] at co.elastic.apm.agent.report.IntakeV2ReportingEventHandler.startRequest(IntakeV2ReportingEventHandler.java:165) [elastic-apm-agent-1.28.4.jar:?] at co.elastic.apm.agent.report.IntakeV2ReportingEventHandler.handleIntakeEvent(IntakeV2ReportingEventHandler.java:112) [elastic-apm-agent-1.28.4.jar:?] at co.elastic.apm.agent.report.IntakeV2ReportingEventHandler.dispatchEvent(IntakeV2ReportingEventHandler.java:98) [elastic-apm-agent-1.28.4.jar:?] at co.elastic.apm.agent.report.IntakeV2ReportingEventHandler.onEvent(IntakeV2ReportingEventHandler.java:69) [elastic-apm-agent-1.28.4.jar:?] at co.elastic.apm.agent.report.IntakeV2ReportingEventHandler.onEvent(IntakeV2ReportingEventHandler.java:36) [elastic-apm-agent-1.28.4.jar:?] at com.lmax.disruptor.BatchEventProcessor.processEvents(BatchEventProcessor.java:168) [elastic-apm-agent-1.28.4.jar:?] at com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:125) [elastic-apm-agent-1.28.4.jar:?] at java.lang.Thread.run(Thread.java:825) [?:2.9 (06-22-2021)] 2022-02-08 12:13:34,303 [elastic-apm-server-reporter] INFO co.elastic.apm.agent.report.IntakeV2ReportingEventHandler - Backing off for 36 seconds (+/-10%) **Kibana version** : 7:17 **Elasticsearch version** :7:17 **APM Server version** :7:17 **APM Agent language and version** : Java agent version 1.28.4 **Browser version** : **Original install method (e.g. download page, yum, deb, from source, etc.) and version**:yum **Fresh install or upgraded from other version?** : uPGRADE FROM 7.16 **Is there anything special in your setup?** For example, are you using the Logstash or Kafka outputs? Are you using a load balancer in front of the APM Servers? Have you changed index pattern, generated custom templates, changed agent configuration etc. No **Description of the problem including expected versus actual behavior. Please include screenshots (if relevant)**: **Steps to reproduce** : 1. 2. 3. **Errors in browser console (if relevant)**: **Provide logs and/or server output (if relevant)**: ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [March 1, 2022, 1:15pm UTC](https://discuss.elastic.co/t/elastic-apm-java-agent-could-not-connect-to-apm-server/296642/2 "2022-03-01T13:15:00Z")
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