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1 .背景

由于需要使用Jython。但是发现一个诡异的现象IDE使用没有问题，但是打包jar报错。

            Properties props = new Properties();
            props.put("python.home","D:\\jython2.7.2");
            props.put("python.path","D:\\jython2.7.2\\Lib\\site-packages");
            props.put("python.console.encoding", "UTF-8"); // Used to prevent: console: Failed to install '': java.nio.charset.UnsupportedCharsetException: cp0.
            props.put("python.security.respectJavaAccessibility", "false"); //don't respect java accessibility, so that we can access protected members on subclasses
            props.put("python.import.site","false");
            //props.put("python.cachedir.skip","true");

            props.put("org.python.netty.noUnsafe","true");

            Properties preprops = System.getProperties();

            PythonInterpreter.initialize(preprops, props, new String[0]);// 此处报异常

            PythonInterpreter pyInterp = new PythonInterpreter();

java.lang.IllegalArgumentException: URI is not hierarchical
        at java.io.File.<init>(File.java:418)
        at org.python.core.PrePy.getJarFileNameFromURL(PrePy.java:427)
        at org.python.core.PrePy._getJarFileName(PrePy.java:362)
        at org.python.core.PrePy.getJarFileName(PrePy.java:345)
        at org.python.core.PySystemState.doInitialize(PySystemState.java:1195)
        at org.python.core.PySystemState.initialize(PySystemState.java:1130)
        at org.python.core.PySystemState.initialize(PySystemState.java:1085)
        at org.python.core.PySystemState.initialize(PySystemState.java:1080)
        at org.python.util.PythonInterpreter.initialize(PythonInterpreter.java:63)
        at com.langtutu.ncs.api.robot.core.Test.<init>(Test.java:34)
        at com.langtutu.ncs.api.service.impl.HomestaySchedulingServiceImpl.DownOrderTest(HomestaySchedulingServiceImpl.java:90)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:84)
        at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
        at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

2. 问题查找

使用IDE和远程调用分别调试跟踪了一下jython，定位到代码报错行：

• IDE调试 发现url是如下的： jar:file:/D:/maven/apache-maven-3.3.9/repository/org/python/jython/2.7.2/jython-2.7.2.jar!/org/python/core/PrePy.class

• 远程调试

嵌套不能用。

3. 解决方案：

maven打包时候将jython剔除；运行时候加载外部jar包即可。

剔除：

<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<version>2.2.10.RELEASE</version>
				<configuration>
					<layout>ZIP</layout>
					<!--去除在生产环境中不变的依赖 多个用逗号隔开,-->
					<excludeGroupIds>
						org.python
					</excludeGroupIds>
				</configuration>
			</plugin>
		</plugins>
	</build>

运行：

java -Dloader.path="lib/" -jar .\ncsapi-0.0.1-SNAPSHOT.jar

lib里面就是jar包。此时运行完全正常

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