Have you checked out something like Eureka Streams? I don't know all of its capabilities, but it is free (and open source), and, from the website, it looks like it has everything you're looking for. (The only thing I am unsure about is the API to make remote calls from a Java server.)
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您是否检查过类似 Eureka Streams 的内容？我不知道它的所有功能，但它是免费的（并且开源），并且来自该网站，看起来它拥有您正在寻找的一切。 （我唯一不确定的是从 Java 服务器进行远程调用的 API。）
Have you checked out something like Eureka Streams? I don't know all of its capabilities, but it is free (and open source), and, from the website, it looks like it has everything you're looking for. (The only thing I am unsure about is the API to make remote calls from a Java server.)