[08:26:33 WARN]: org.apache.commons.lang.UnhandledException: Plugin ChestShop v3.8.1 generated an exception while executing task 75
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: javax.persistence.PersistenceException: java.sql.SQLException: Unsuccessfully waited [1000] millis for a connection to be returned. No connections are free. You need to Increase the max connections of [20] or look for a connection pool leak using datasource.xxx.capturestacktrace=true
        at com.avaje.ebeaninternal.server.transaction.TransactionManager.createTransaction(TransactionManager.java:350)
        at com.avaje.ebeaninternal.server.core.DefaultServer.initTransIfRequired(DefaultServer.java:2068)
        at com.avaje.ebeaninternal.server.core.DefaultServer.save(DefaultServer.java:1814)
        at com.avaje.ebeaninternal.server.core.DefaultServer.save(DefaultServer.java:1806)
        at com.Acrobot.ChestShop.DB.Queue.run(Queue.java:24)
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftTask.run(CraftTask.java:71)
        at org.bukkit.craftbukkit.v1_8_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:53)
        ... 3 more
Caused by: java.sql.SQLException: Unsuccessfully waited [1000] millis for a connection to be returned. No connections are free. You need to Increase the max connections of [20] or look for a connection pool leak using datasource.xxx.capturestacktrace=true
        at com.avaje.ebeaninternal.server.lib.sql.PooledConnectionQueue._getPooledConnectionWaitLoop(PooledConnectionQueue.java:333)
        at com.avaje.ebeaninternal.server.lib.sql.PooledConnectionQueue._getPooledConnection(PooledConnectionQueue.java:307)
        at com.avaje.ebeaninternal.server.lib.sql.PooledConnectionQueue.getPooledConnection(PooledConnectionQueue.java:247)
        at com.avaje.ebeaninternal.server.lib.sql.DataSourcePool.getPooledConnection(DataSourcePool.java:653)
        at com.avaje.ebeaninternal.server.lib.sql.DataSourcePool.getConnection(DataSourcePool.java:641)
        at com.avaje.ebeaninternal.server.transaction.TransactionManager.createTransaction(TransactionManager.java:316)
        ... 9 more