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java.lang.OutOfMemoryError: Java heap space	at org.apache.log4j.Category.forcedLog(Category.java:391)	at org.apache.log4j.Category.log(Category.java:856)	at org.slf4j.impl.Log4jLoggerAdapter.warn(Log4jLoggerAdapter.java:478)	at io.netty.util.internal.logging.Slf4JLogger.warn(Slf4JLogger.java:151)	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:367)	at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:116)	at java.lang.Thread.run(Thread.java:745)