websocket 发送问题

使用websocket发数，有时候会发送失败。

session.getAsyncRemote().sendObject("xxx", r -> {
    if (!r.isOK()) {
       System.out.println("err:" + r.getException());
    }
});

错误信息为：java.lang.IllegalStateException: The remote endpoint was in state [TEXT_FULL_WRITING] which is an invalid state for called method

问题原因：同一个时刻,多个线程向同一个socket写数据冲突了就会报此异常信息。

解决办法：给session加锁

synchronized (session) {
    session.getAsyncRemote().sendObject("xxx", r -> {
        if (!r.isOK()) {
            System.out.println("err:" + r.getException());
        }
    });
}

websocket api 参考https://abhishek-gupta.gitbook.io/java-websocket-api-handbook/