{"id":1217,"date":"2023-02-23T10:53:27","date_gmt":"2023-02-23T02:53:27","guid":{"rendered":"https:\/\/www.chenweikang.top\/?p=1217"},"modified":"2023-02-23T11:00:00","modified_gmt":"2023-02-23T03:00:00","slug":"java%e7%8e%af%e5%a2%83%e8%bf%90%e8%a1%8cpython%e8%84%9a%e6%9c%ac%ef%bc%9acannot-invoke-javax-script-scriptengine-getfactory-because-scriptengine-is-null","status":"publish","type":"post","link":"https:\/\/www.chenweikang.top\/?p=1217","title":{"rendered":"java\u73af\u5883\u8fd0\u884cpython\u811a\u672c\uff1aCannot invoke \"javax.script.ScriptEngine.getFactory()\" because \"scriptEngine\" is null"},"content":{"rendered":"\n

\u5728\u7528Liteflow\u89c4\u5219\u5f15\u64ce\u4e2d\uff0c\u7528\u5230\u4e86python\u811a\u672c\uff0c\u53d1\u73b0ide\u542f\u52a8\u65f6\u811a\u672c\u6b63\u5e38\u8fd0\u884c\uff0c\u5230\u4e86\u7ebf\u4e0a\u73af\u5883\u5c31\u62a5\u5f02\u5e38\u3002\u7ecf\u8fc7\u8c03\u8bd5\u53d1\u73b0 scriptEngineManager.getEngineByName(\"python\");\u83b7\u53d6\u5230\u7684engine\u4e3anull\u3002<\/p>\n\n\n\n

public ScriptExecutor init() throws ScriptException {
    ScriptEngineManager scriptEngineManager = new ScriptEngineManager();
    scriptEngine = scriptEngineManager.getEngineByName(scriptEngineName());
    if (scriptEngine == null) {
        log<\/em>.error(\"load scriptEngine[{}] error: scriptEngine is null!\", scriptEngineName());
        throw new ScriptException(\"load scriptEngine[\" + scriptEngineName() + \"] error, scriptEngine is null !\");
    }
    return this;
}<\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u6b63\u597d\u521a\u6ce8\u518c\u4e86\u4e2aGhatGpt\uff0c\u4e8e\u662f\u76f4\u63a5\u6765\u95ee\u4e00\u4e0b\uff1a
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\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
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\"\"<\/figure>\n\n\n\n
\u6839\u636eChatGpt\u63d0\u793a\u5c1d\u8bd5\u65b0\u589epython.home\uff0c\u6307\u5b9a jython-standalone-2.7.3.jar\u7684\u7edd\u5bf9\u8def\u5f84\u53ef\u4ee5\u89e3\u51b3\u3002<\/p>\n\n\n\n
\u7531\u4e8e\u5e94\u7528\u6253\u597dJar\u5305\u91cc\u9762\u5df2\u7ecf\u6709\u4e86jython-standalone\u4f9d\u8d56\uff0c\u4e0d\u60f3\u518d\u5728\u90e8\u7f72\u7684\u65f6\u5019\u989d\u5916\u62ff\u4e2ajar\u5305\u8fdb\u53bb\uff0c\u6240\u4ee5\u53c8\u505a\u4e86\u70b9\u6539\u52a8\uff1a\u5e94\u7528\u542f\u52a8\u65f6\uff0c\u5224\u65ad\u5f53jar\u5305\u8fd0\u884c\u65f6\uff0c\u4eceBOOT-INF\/lib\u4e0b\u5c06jython\u62f7\u8d1d\u51fa\u6765\uff0c\u5e76\u8bbe\u7f6epython.home:
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@Slf4j\n@Component\npublic class ApplicationInitRunner implements CommandLineRunner {\n\n    @Value(\"${python.home:}\")\n    private String pythonHome;\n\n    @Override\n    public void run(String... args)  {\n        if (StringUtils.isNotBlank<\/em>(pythonHome)) {\n            \/\/\u590d\u5236jython\u5305\u5230python home\n            <\/em>boolean copyed = JarExtractor.copyJython2PythonHome<\/em>(pythonHome);\n            if(copyed){\n                System.setProperty<\/em>(\"python.import.site\",\"false\");\n                System.setProperty<\/em>(\"python.home\",pythonHome);\n            }\n        }\n    }\n\n}<\/pre>\n\n\n\n
\u4ee5\u4e0b\u62f7\u8d1djar\u5305\u4ee3\u7801\u7247\u6bb5\uff1a<\/p>\n\n\n\n
final static String jythonName <\/em>= \"jython-standalone-2.7.3.jar\";

\/**
<\/em> * <\/em>\u5224\u65ad\u662f\u5426\u4ece<\/em>jar<\/em>\u5305\u8fd0\u884c
<\/em> <\/em>* @return
<\/em> *\/
<\/em>public static boolean isRunningFromJar() {
    URL resource = JarExtractor.class.getResource(\"\");
    return resource != null && resource.getProtocol().equals(\"jar\");
}

public static boolean copyJython2PythonHome(String pythonHome){
    return copyJar<\/em>(jythonName<\/em>,pythonHome);
}

\/**
<\/em> * <\/em>\u62f7\u8d1d\u5305\u91cc\u7684\u4f9d\u8d56\u5230\u6307\u5b9a\u76ee\u5f55
<\/em> <\/em>* @param <\/em>jarName
<\/em> <\/em>* @param <\/em>targetPath
<\/em> <\/em>*\/
<\/em>public static boolean copyJar(String jarName,String targetPath){
    if(isRunningFromJar<\/em>()){
        ClassLoader defaultClassLoader = ClassUtils.getDefaultClassLoader<\/em>();
        try (InputStream inputStream = defaultClassLoader.getResourceAsStream(\"BOOT-INF\/lib\/\"+jarName)) {
            if(inputStream != null){
                log<\/em>.info(\"CopyJar:{} -> {}\",jarName,targetPath);
                write2File<\/em>(inputStream,targetPath);
                return true;
            }
        } catch (Exception e) {
            log<\/em>.error(\"jar {} -> {} copy error: {}\",jarName,e.getMessage());
        }
    }
    return false;
}<\/pre>\n
\u8f6c\u8f7d\u8bf7\u6ce8\u660e\uff1a\u5de6\u624b\u4ee3\u7801\u53f3\u624b\u8bd7<\/a> » java\u73af\u5883\u8fd0\u884cpython\u811a\u672c\uff1aCannot invoke \"javax.script.ScriptEngine.getFactory()\" because \"scriptEngine\" is null<\/a><\/p>
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