根据Apache apisix官方文档，目前已经支持通过Java插件运行器在Apache apisix中运行Java插件。Java插件运行器已经在生产环境中得到了广泛应用，并且在持续改进和更新中。

在使用Java插件运行器时，需要按照以下步骤进行操作：

1. 在Apache apisix配置文件中添加Java插件运行器的配置：

plugins:
  enable: true
  dir: ${APISIX_HOME}/plugins
  max_filter_num: 20
  lua_plugin_server_names:
    - http
  java_plugin_server_names:
    - http
    - grpc
  java_plugin_runner:
    worker_num: 1
    timeout: 2000
    script: ${APISIX_HOME}/plugins/java-runner/bin/runner.sh
    classpath:
      - ${APISIX_HOME}/plugins/java-runner/lib/*
      - ${APISIX_HOME}/plugins/java-runner/plugin/*

2. 创建Java插件，并编译为jar包。

3. 将编译后的jar包放置在${APISIX_HOME}/plugins/java-runner/plugin/目录下。

4. 通过Java注解声明插件实现类，示例代码如下：

package org.apache.apisix.plugin.demo;

import org.apache.apisix.plugin.annotation.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@ApiProvider(clusterName = "apisix", tag = "1.0", upstreamTimeout = 2000)
public class DemoPlugin {
    private static final Logger logger = LoggerFactory.getLogger(DemoPlugin.class);

    @Api(value = "/hello", upstream = "http://httpbin.org/get", desc = "demo hello")
    public ApiResponse hello(ApiRequest request) {
        logger.info("request: {}", request);
        return new ApiResponse(200, "hello");
    }
}

5. 重启Apache apisix服务，并使用插件的Api路径进行访问测试。

参考链接：https://github.com/apache/apisix-java-plugin-runner#the-basic-usage-of-java-plugins-in-apisix