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    This bug happens on jenkins 2.1 with gitLab plugin 1.2.2, try updating plugin to 1.2.3 or further.

Solutions on the web

via Google Groups by Unknown author, 1 year ago
Invalid use of BasicClientConnManager: connection still allocated. Make sure to release the connection before
via Stack Overflow by Sandip Das
, 1 year ago
Invalid use of BasicClientConnManager: connection still allocated. Make sure to release the connection before allocating another one.
via GitHub by Abdull
, 1 year ago
Invalid use of BasicClientConnManager: connection still allocated. Make sure to release the connection before allocating another one.
via Stack Overflow by CDU
, 2 years ago
Invalid use of BasicClientConnManager: connection still allocated. Make sure to release the connection before allocating another one.
via Stack Overflow by Louis Biron
, 2 years ago
Invalid use of BasicClientConnManager: connection still allocated. Make sure to release the connection before allocating another one.
via Stack Overflow by Baz
, 1 year ago
Invalid use of BasicClientConnManager: connection still allocated. Make sure to release the connection before allocating another one.
java.lang.IllegalStateException: Invalid use of BasicClientConnManager:
 connection still allocated. Make sure to release the connection before	at org.apache.http.util.Asserts.check(Asserts.java:34)	at org.apache.http.impl.conn.BasicClientConnectionManager.getConnection(BasicClientConnectionManager.java:166)	at org.apache.http.impl.conn.BasicClientConnectionManager$1.getConnection(BasicClientConnectionManager.java:148)	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:424)	at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:884)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107)	at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:55)	at org.jmeterplugins.repository.PluginManager.getJSON(PluginManager.java:137)	at org.jmeterplugins.repository.PluginManager.load(PluginManager.java:78)	at org.jmeterplugins.repository.PluginManagerDialog.componentShown(PluginManagerDialog.java:178)	at java.awt.Component.processComponentEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at java.awt.Window.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)	at java.awt.EventQueue.access$500(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.WaitDispatchSupport$2.run(Unknown Source)	at java.awt.WaitDispatchSupport$4.run(Unknown Source)	at java.awt.WaitDispatchSupport$4.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.awt.WaitDispatchSupport.enter(Unknown Source)	at java.awt.Dialog.show(Unknown Source)	at java.awt.Component.show(Unknown Source)	at java.awt.Component.setVisible(Unknown Source)	at java.awt.Window.setVisible(Unknown Source)	at java.awt.Dialog.setVisible(Unknown Source)	at org.jmeterplugins.repository.PluginManagerMenuItem.actionPerformed(PluginManagerMenuItem.java:41)	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)	at javax.swing.AbstractButton.doClick(Unknown Source)	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)	at java.awt.Component.processMouseEvent(Unknown Source)	at javax.swing.JComponent.processMouseEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)	at java.awt.EventQueue.access$500(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.awt.EventQueue$3.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.awt.EventQueue$4.run(Unknown Source)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.run(Unknown Source)