{"id":27980,"date":"2024-03-16T09:33:06","date_gmt":"2024-03-16T09:33:06","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/"},"modified":"2024-03-22T12:20:45","modified_gmt":"2024-03-22T12:20:45","slug":"when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/","title":{"rendered":"When C# calls a Java package, it throws an error stating: &#8220;The type initializer for java.lang.StdIO&#8221;"},"content":{"rendered":"<p>To call a Java package in C#, you need to use Java interoperability features. Common methods include using Java Native Interface (JNI) or Java Native Access (JNA). Here is an example of using JNI:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">using<\/span> System;\r\n<span class=\"hljs-keyword\">using<\/span> System.Runtime.InteropServices;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">Program<\/span>\r\n{\r\n    <span class=\"hljs-comment\">\/\/ \u52a0\u8f7dJava\u5e93<\/span>\r\n    [<span class=\"hljs-meta\">DllImport(<span class=\"hljs-string\">\"jvm.dll\"<\/span>)<\/span>]\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">extern<\/span> <span class=\"hljs-built_in\">int<\/span> <span class=\"hljs-title\">JNI_CreateJavaVM<\/span>(<span class=\"hljs-params\"><span class=\"hljs-keyword\">out<\/span> IntPtr jvm, <span class=\"hljs-keyword\">out<\/span> IntPtr env, IntPtr vmArgs<\/span>)<\/span>;\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">Main<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span>[] args<\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-comment\">\/\/ \u521b\u5efaJava\u865a\u62df\u673a<\/span>\r\n        IntPtr jvm;\r\n        IntPtr env;\r\n        <span class=\"hljs-built_in\">int<\/span> result = JNI_CreateJavaVM(<span class=\"hljs-keyword\">out<\/span> jvm, <span class=\"hljs-keyword\">out<\/span> env, IntPtr.Zero);\r\n        <span class=\"hljs-keyword\">if<\/span> (result &lt; <span class=\"hljs-number\">0<\/span>)\r\n        {\r\n            Console.WriteLine(<span class=\"hljs-string\">\"\u65e0\u6cd5\u521b\u5efaJava\u865a\u62df\u673a\"<\/span>);\r\n            <span class=\"hljs-keyword\">return<\/span>;\r\n        }\r\n\r\n        <span class=\"hljs-keyword\">try<\/span>\r\n        {\r\n            <span class=\"hljs-comment\">\/\/ \u8c03\u7528Java\u4ee3\u7801<\/span>\r\n            JNIEnv jniEnv = <span class=\"hljs-keyword\">new<\/span> JNIEnv(env);\r\n            JClass stdioClass = jniEnv.FindClass(<span class=\"hljs-string\">\"java\/lang\/StdIO\"<\/span>);\r\n            <span class=\"hljs-keyword\">if<\/span> (stdioClass == <span class=\"hljs-literal\">null<\/span>)\r\n            {\r\n                Console.WriteLine(<span class=\"hljs-string\">\"\u65e0\u6cd5\u627e\u5230java.lang.StdIO\u7c7b\"<\/span>);\r\n                <span class=\"hljs-keyword\">return<\/span>;\r\n            }\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u8c03\u7528StdIO\u7684\u65b9\u6cd5<\/span>\r\n            JMethodID printMethod = jniEnv.GetStaticMethodID(stdioClass, <span class=\"hljs-string\">\"print\"<\/span>, <span class=\"hljs-string\">\"(Ljava\/lang\/String;)V\"<\/span>);\r\n            <span class=\"hljs-keyword\">if<\/span> (printMethod == <span class=\"hljs-literal\">null<\/span>)\r\n            {\r\n                Console.WriteLine(<span class=\"hljs-string\">\"\u65e0\u6cd5\u627e\u5230print\u65b9\u6cd5\"<\/span>);\r\n                <span class=\"hljs-keyword\">return<\/span>;\r\n            }\r\n\r\n            jstring message = jniEnv.NewStringUTF(<span class=\"hljs-string\">\"Hello from C#!\"<\/span>);\r\n            jniEnv.CallStaticVoidMethod(stdioClass, printMethod, message);\r\n        }\r\n        <span class=\"hljs-keyword\">finally<\/span>\r\n        {\r\n            <span class=\"hljs-comment\">\/\/ \u9500\u6bc1Java\u865a\u62df\u673a<\/span>\r\n            jniEnv.DestroyJavaVM();\r\n        }\r\n    }\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ \u8f85\u52a9\u7c7b\u6765\u5904\u7406JNI\u8c03\u7528<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">JNIEnv<\/span>\r\n{\r\n    <span class=\"hljs-keyword\">private<\/span> IntPtr env;\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title\">JNIEnv<\/span>(<span class=\"hljs-params\">IntPtr env<\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-keyword\">this<\/span>.env = env;\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> JClass <span class=\"hljs-title\">FindClass<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span> className<\/span>)<\/span>\r\n    {\r\n        IntPtr classRef = CallObjectMethod(<span class=\"hljs-string\">\"FindClass\"<\/span>, <span class=\"hljs-keyword\">new<\/span> JString(className).Handle);\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-keyword\">new<\/span> JClass(classRef, <span class=\"hljs-keyword\">this<\/span>);\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> JMethodID <span class=\"hljs-title\">GetStaticMethodID<\/span>(<span class=\"hljs-params\">JClass classRef, <span class=\"hljs-built_in\">string<\/span> methodName, <span class=\"hljs-built_in\">string<\/span> signature<\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-keyword\">new<\/span> JMethodID(CallObjectMethod(<span class=\"hljs-string\">\"GetStaticMethodID\"<\/span>, classRef.Handle, <span class=\"hljs-keyword\">new<\/span> JString(methodName).Handle, <span class=\"hljs-keyword\">new<\/span> JString(signature).Handle), <span class=\"hljs-keyword\">this<\/span>);\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">CallStaticVoidMethod<\/span>(<span class=\"hljs-params\">JClass classRef, JMethodID methodId, jvalue[] args<\/span>)<\/span>\r\n    {\r\n        CallVoidMethod(<span class=\"hljs-string\">\"CallStaticVoidMethod\"<\/span>, classRef.Handle, methodId.Handle, args);\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">DestroyJavaVM<\/span>()<\/span>\r\n    {\r\n        CallVoidMethod(<span class=\"hljs-string\">\"DestroyJavaVM\"<\/span>);\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">private<\/span> IntPtr <span class=\"hljs-title\">CallObjectMethod<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span> methodName, <span class=\"hljs-keyword\">params<\/span> IntPtr[] args<\/span>)<\/span>\r\n    {\r\n        IntPtr methodId = GetMethodID(methodName, args);\r\n        <span class=\"hljs-keyword\">return<\/span> CallObjectMethod(methodId, args);\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">private<\/span> IntPtr <span class=\"hljs-title\">CallObjectMethod<\/span>(<span class=\"hljs-params\">IntPtr methodId, <span class=\"hljs-keyword\">params<\/span> IntPtr[] args<\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-keyword\">return<\/span> JNI.CallObjectMethod(env, methodId, args);\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">CallVoidMethod<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span> methodName, <span class=\"hljs-keyword\">params<\/span> IntPtr[] args<\/span>)<\/span>\r\n    {\r\n        IntPtr methodId = GetMethodID(methodName, args);\r\n        CallVoidMethod(methodId, args);\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">CallVoidMethod<\/span>(<span class=\"hljs-params\">IntPtr methodId, <span class=\"hljs-keyword\">params<\/span> IntPtr[] args<\/span>)<\/span>\r\n    {\r\n        JNI.CallVoidMethod(env, methodId, args);\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">private<\/span> IntPtr <span class=\"hljs-title\">GetMethodID<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span> methodName, IntPtr[] args<\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-keyword\">return<\/span> CallObjectMethod(<span class=\"hljs-string\">\"GetMethodID\"<\/span>, args[<span class=\"hljs-number\">0<\/span>], <span class=\"hljs-keyword\">new<\/span> JString(methodName).Handle, args[<span class=\"hljs-number\">1<\/span>]);\r\n    }\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ Java\u5b57\u7b26\u4e32\u7c7b\u7684\u5c01\u88c5<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">JString<\/span>\r\n{\r\n    <span class=\"hljs-keyword\">public<\/span> IntPtr Handle { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">set<\/span>; }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title\">JString<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span> <span class=\"hljs-keyword\">value<\/span><\/span>)<\/span>\r\n    {\r\n        Handle = JNI.NewStringUTF(<span class=\"hljs-keyword\">value<\/span>);\r\n    }\r\n\r\n    ~JString()\r\n    {\r\n        JNI.DeleteLocalRef(Handle);\r\n    }\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ Java\u7c7b\u7684\u5c01\u88c5<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">JClass<\/span>\r\n{\r\n    <span class=\"hljs-keyword\">public<\/span> IntPtr Handle { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">set<\/span>; }\r\n    <span class=\"hljs-keyword\">private<\/span> JNIEnv env;\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title\">JClass<\/span>(<span class=\"hljs-params\">IntPtr handle, JNIEnv env<\/span>)<\/span>\r\n    {\r\n        Handle = handle;\r\n        <span class=\"hljs-keyword\">this<\/span>.env = env;\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> JMethodID <span class=\"hljs-title\">GetStaticMethodID<\/span>(<span class=\"hljs-params\"><span class=\"hljs-built_in\">string<\/span> methodName, <span class=\"hljs-built_in\">string<\/span> signature<\/span>)<\/span>\r\n    {\r\n        <span class=\"hljs-keyword\">return<\/span> env.GetStaticMethodID(<span class=\"hljs-keyword\">this<\/span>, methodName, signature);\r\n    }\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/ Java\u65b9\u6cd5\u7684\u5c01\u88c5<\/span>\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title\">JMethodID<\/span>\r\n{\r\n    <span class=\"hljs-keyword\">public<\/span> IntPtr Handle { <span class=\"hljs-keyword\">get<\/span>; <span class=\"hljs-keyword\">private<\/span> <span class=\"hljs-keyword\">set<\/span>; }\r\n    <span class=\"hljs-keyword\">private<\/span> JNIEnv env;\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title\">JMethodID<\/span>(<span class=\"hljs-params\">IntPtr handle, JNIEnv env<\/span>)<\/span>\r\n    {\r\n        Handle = handle;\r\n        <span class=\"hljs-keyword\">this<\/span>.env = env;\r\n    }\r\n\r\n    <span class=\"hljs-function\"><span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title\">CallStaticVoidMethod<\/span>(<span class=\"hljs-params\"><span class=\"hljs-keyword\">params<\/span> jvalue[] args<\/span>)<\/span>\r\n    {\r\n        env.CallStaticVoidMethod(<span class=\"hljs-keyword\">this<\/span>, args);\r\n    }\r\n}\r\n\r\n<span class=\"hljs-comment\">\/\/<\/span><\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>To call a Java package in C#, you need to use Java interoperability features. Common methods include using Java Native Interface (JNI) or Java Native Access (JNA). Here is an example of using JNI: using System; using System.Runtime.InteropServices; public class Program { \/\/ \u52a0\u8f7dJava\u5e93 [DllImport(&#8220;jvm.dll&#8221;)] private static extern int JNI_CreateJavaVM(out IntPtr jvm, out IntPtr env, [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-27980","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>When C# calls a Java package, it throws an error stating: &quot;The type initializer for java.lang.StdIO&quot; - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"When C# calls a Java package, it throws an error stating: &quot;The type initializer for java.lang.StdIO&quot;\" \/>\n<meta property=\"og:description\" content=\"To call a Java package in C#, you need to use Java interoperability features. Common methods include using Java Native Interface (JNI) or Java Native Access (JNA). Here is an example of using JNI: using System; using System.Runtime.InteropServices; public class Program { \/\/ \u52a0\u8f7dJava\u5e93 [DllImport(&quot;jvm.dll&quot;)] private static extern int JNI_CreateJavaVM(out IntPtr jvm, out IntPtr env, [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T09:33:06+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T12:20:45+00:00\" \/>\n<meta name=\"author\" content=\"Ava Mitchell\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Ava Mitchell\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/\"},\"author\":{\"name\":\"Ava Mitchell\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/a3e2658c2cb9fb2be95ae0a8861f4a64\"},\"headline\":\"When C# calls a Java package, it throws an error stating: &#8220;The type initializer for java.lang.StdIO&#8221;\",\"datePublished\":\"2024-03-16T09:33:06+00:00\",\"dateModified\":\"2024-03-22T12:20:45+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/\"},\"wordCount\":52,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/\",\"name\":\"When C# calls a Java package, it throws an error stating: \\\"The type initializer for java.lang.StdIO\\\" - 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Common methods include using Java Native Interface (JNI) or Java Native Access (JNA). Here is an example of using JNI: using System; using System.Runtime.InteropServices; public class Program { \/\/ \u52a0\u8f7dJava\u5e93 [DllImport(\"jvm.dll\")] private static extern int JNI_CreateJavaVM(out IntPtr jvm, out IntPtr env, [&hellip;]","og_url":"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/","og_site_name":"Blog - Silicon Cloud","article_publisher":"https:\/\/www.facebook.com\/SiliCloudGlobal\/","article_published_time":"2024-03-16T09:33:06+00:00","article_modified_time":"2024-03-22T12:20:45+00:00","author":"Ava Mitchell","twitter_card":"summary_large_image","twitter_creator":"@SiliCloudGlobal","twitter_site":"@SiliCloudGlobal","twitter_misc":{"Written by":"Ava Mitchell","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/#article","isPartOf":{"@id":"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/"},"author":{"name":"Ava Mitchell","@id":"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/a3e2658c2cb9fb2be95ae0a8861f4a64"},"headline":"When C# calls a Java package, it throws an error stating: &#8220;The type initializer for java.lang.StdIO&#8221;","datePublished":"2024-03-16T09:33:06+00:00","dateModified":"2024-03-22T12:20:45+00:00","mainEntityOfPage":{"@id":"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/"},"wordCount":52,"commentCount":0,"publisher":{"@id":"https:\/\/www.silicloud.com\/blog\/#organization"},"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/","url":"https:\/\/www.silicloud.com\/blog\/when-c-calls-a-java-package-it-throws-an-error-stating-the-type-initializer-for-java-lang-stdio\/","name":"When C# calls a Java package, it throws an error stating: \"The type initializer for java.lang.StdIO\" - 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