最近重構一個Java寫的計算器專案.專案中核心實現是用Jython來進行計算過程的.由於是老專案,直接使用的是Maven+Javaweb方式.

依賴:

<dependency>
  <groupId>org.python</groupId>
  <artifactId>jython-standalone</artifactId>
  <version>2.7.0</version>
</dependency>

計算過程程式碼:

ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("python");
// To calculate the equation by script engine. We use jython here.
engine.eval(convertedEquation);

這樣直接啟動後執行是沒有問題的,但是我們現在的架構是用Bazel來進行專案和依賴管理(這裡不得不吐槽下,Bazel比Maven對於Java專案而言差不多).我們直接遷移過來,直接執行,沒有問題,如果是打包後在執行就會報錯!

[com.mobvoi.onebox.calculator.service.impl.CalculatorSearchService.search(CalculatorSearchService.java:38), com.mobvoi.onebox.calculator.controller.CalculatorController.search(CalculatorController.java:41), sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method), sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62), sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43), java.lang.reflect.Method.invoke(Method.java:498), org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209), org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136), org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102), org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:870), org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:776), org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87), org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991), org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925), org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978), org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:881), javax.servlet.http.HttpServlet.service(HttpServlet.java:661), org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855), javax.servlet.http.HttpServlet.service(HttpServlet.java:742), org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231), org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166), org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52), org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193), org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166), org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99), org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107), org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193), org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166), org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109), org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107), org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193), org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166), org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81), org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107), org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193), org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166), org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200), org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107), org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193), org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166), org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199), org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96), org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496), org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140), org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81), org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87), org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342), org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803), org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66), org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790), org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459), org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49), java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149), java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624), org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61), java.lang.Thread.run(Thread.java:748)]

從網上找到類似的問題:

https://stackoverrun.com/cn/q/9411235

<build> 
    <plugins> 
     <plugin> 
      <groupId>org.springframework.boot</groupId> 
      <artifactId>spring-boot-maven-plugin</artifactId> 
      <configuration> 
       <requiresUnpack> 
        <dependency> 
         <groupId>org.jruby</groupId> 
         <artifactId>jruby-complete</artifactId> 
        </dependency> 
       </requiresUnpack> 
      </configuration> 
     </plugin> 
    </plugins> 
</build> 
 

用這個方式在spring-boot專案中實驗下,是可以使用.但是我們專案用的是Bazel,要重新想辦法進行解決.

我們加入以下設定:

@Override
public void afterPropertiesSet() throws Exception {
  //初始化python引擎
  Properties props = new Properties();
  props.put("python.home", "path to the Lib folder");
  props.put("python.console.encoding", "UTF-8");

  props.put("python.security.respectJavaAccessibility", "false");

  props.put("python.import.site", "false");

  Properties preprops = System.getProperties();
  PythonInterpreter.initialize(preprops, props, new String[0]);
}

就能啟動服務了.