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公司的项目，这几天添加了一个统计功能，本地测试没太大问题，上线后有一个问题，具体现象描述如下：

统计首页接口大约有5-6个，也就是同时需要访问6个接口拿首页数据
这些接口浏览器访问会随机的，偶尔的出现跨域错误，提示CROS。但偶尔又能全部正常访问
本地测试没有问题CROS问题

基于以上描述，首先想到可能nginx会有问题，因为线上和测试环境就只加了一层转发。而测试环境没有这个问题，于是直接暴露线上服务端口访问，故障依旧。

这里没太想明白为啥是cros错误，对比了下options请求响应，都是正常请求响应的，响应数据也是正确的。所以这个问题暂记下

但是本地启动为什么没有CROS问题呢，看了下线上启动脚本，线上启动有添加堆大小限制的启动命令（限制为512MB）。本地同步添加，果然问题就在本地复现了。

访问浏览器提示跨域时，服务后台日志如下：

14:50:41.003 [http-nio-8985-exec-60] ERROR o.a.c.h.Http11NioProtocol - [log,175] - Failed to complete processing of a request
java.lang.OutOfMemoryError: Java heap space
14:50:41.210 [http-nio-8985-exec-58] ERROR o.a.c.h.Http11NioProtocol - [log,175] - Failed to complete processing of a request
java.lang.OutOfMemoryError: Java heap space
14:50:41.211 [http-nio-8985-exec-60] ERROR o.a.t.u.n.NioEndpoint - [log,175] - Error running socket processor
java.lang.NullPointerException: Cannot invoke "java.nio.ByteBuffer.limit(int)" because "this.byteBuffer" is nullat org.apache.coyote.http11.Http11InputBuffer.recycle(Http11InputBuffer.java:262)at org.apache.coyote.http11.Http11Processor.recycle(Http11Processor.java:1418)at org.apache.coyote.AbstractProtocol$ConnectionHandler.release(AbstractProtocol.java:1085)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:1060)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)at java.base/java.lang.Thread.run(Thread.java:842)
14:50:41.211 [http-nio-8985-exec-58] ERROR o.a.t.u.n.NioEndpoint - [log,175] - Error running socket processor
java.lang.NullPointerException: Cannot invoke "java.nio.ByteBuffer.limit(int)" because "this.byteBuffer" is nullat org.apache.coyote.http11.Http11InputBuffer.recycle(Http11InputBuffer.java:262)at org.apache.coyote.http11.Http11Processor.recycle(Http11Processor.java:1418)at org.apache.coyote.AbstractProtocol$ConnectionHandler.release(AbstractProtocol.java:1085)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:1060)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)at java.base/java.lang.Thread.run(Thread.java:842)