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redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool

javax.servlet.ServletException: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
	at vcat.webapp.base.AbstractVCatServlet.doRequest(AbstractVCatServlet.java:69)
	at vcat.toollabs.webapp.AbstractVCatToollabsServlet.doRequest(AbstractVCatToollabsServlet.java:22)
	at vcat.webapp.base.AbstractVCatServlet.doGet(AbstractVCatServlet.java:31)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:313)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool
	at redis.clients.util.Pool.getResource(Pool.java:50)
	at redis.clients.jedis.JedisPool.getResource(JedisPool.java:88)
	at vcat.redis.cache.StringRedisCache.containsKey(StringRedisCache.java:21)
	at vcat.redis.cache.MetadataRedisCache.getMetadata(MetadataRedisCache.java:29)
	at vcat.mediawiki.CachedMetadataProvider.requestMetadata(CachedMetadataProvider.java:28)
	at vcat.params.AbstractAllParams.init(AbstractAllParams.java:83)
	at vcat.toollabs.base.AllParamsToollabs.<init>(AllParamsToollabs.java:16)
	at vcat.toollabs.webapp.ToollabsVCatServlet.renderedFileFromRequest(ToollabsVCatServlet.java:177)
	at vcat.webapp.base.AbstractVCatServlet.doRequest(AbstractVCatServlet.java:41)
	... 20 more
Caused by: java.util.NoSuchElementException: Unable to validate object
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:506)
	at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
	at redis.clients.util.Pool.getResource(Pool.java:48)
	... 28 more
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