jad ( Java Application Discriptor ) 文件是J2ME的一個重要的組成部分，在我們發布J2ME程序的時候，jad文件經常報出各種錯誤，如：

com.sun.kvem.midletsuite.InvalidJadException: Reason = 13

其中的錯誤原因是1-52的代碼，很讓人費解。我在網上找到了這些代碼的解釋，和大家分享如下：

public static final int JAD_SERVER_NOT_FOUND = 1;

public static final int JAD_NOT_FOUND = 2;

public static final int MISSING_PROVIDER_CERT = 4;

public static final int CORRUPT_PROVIDER_CERT = 5;

public static final int UNKNOWN_CA = 6;

public static final int INVALID_PROVIDER_CERT = 7;

public static final int CORRUPT_SIGNATURE = 8;

public static final int INVALID_SIGNATURE = 9;

public static final int UNSUPPORTED_CERT = 10;

public static final int EXPIRED_PROVIDER_CERT = 11;

public static final int EXPIRED_CA_KEY = 12;

public static final int MISSING_SUITE_NAME = 13;

public static final int MISSING_VENDOR = 14;

public static final int MISSING_VERSION = 15;

public static final int INVALID_VERSION = 16;

public static final int OLD_VERSION = 17;

public static final int MISSING_JAR_URL = 18;

public static final int JAR_SERVER_NOT_FOUND = 19;

public static final int JAR_NOT_FOUND = 20;

public static final int MISSING_JAR_SIZE = 21;

public static final int SUITE_NAME_MISMATCH = 25;

public static final int VERSION_MISMATCH = 26;

public static final int VENDOR_MISMATCH = 27;

public static final int INVALID_KEY = 28;

public static final int INVALID_VALUE = 29;

public static final int INSUFFICIENT_STORAGE = 30;

public static final int JAR_SIZE_MISMATCH = 31;

public static final int NEW_VERSION = 32;

public static final int UNAUTHORIZED = 33;

public static final int JAD_MOVED = 34;

public static final int CANNOT_AUTH = 35;

public static final int CORRUPT_JAR = 36;

public static final int INVALID_JAD_TYPE = 37;

public static final int INVALID_JAR_TYPE = 38;

public static final int ALREADY_INSTALLED = 39;

public static final int DEVICE_INCOMPATIBLE = 40;

public static final int MISSING_CONFIGURATION = 41;

public static final int MISSING_PROFILE = 42;

public static final int INVALID_JAD_URL = 43;

public static final int INVALID_JAR_URL = 44;

public static final int PUSH_DUP_FAILURE = 45;

public static final int PUSH_FORMAT_FAILURE = 46;

public static final int PUSH_PROTO_FAILURE = 47;

public static final int PUSH_CLASS_FAILURE = 48;

public static final int AUTHORIZATION_FAILURE = 49;

public static final int ATTRIBUTE_MISMATCH = 50;

public static final int PROXY_AUTH = 51;

public static final int TRUSTED_OVERWRITE_FAILURE = 52;

有了這些代碼的解釋，我們就很容易知道錯誤的原因了。

另外，大家知道，有的手機在安裝jar文件的時候，不需要jad文件。這是因為手機廠商在操作系統中內置了對jar文件的解析功能。就如同手機自動生成jad文件，然后使用這個jad文件安裝jar文件一樣。

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