defineClass für ActiveJdbc Modellwurfausnahme

Question

Wenn ich versuche, meine Modellklasse mit defineClass (findClass URLClassLoader oder Self-Realisation ClassLoader) zu verbinden, tritt die Ausnahme auf.

Alle anderen Methoden werden in mein Modell geladen, erlauben aber kein dynamisches Überladen der Klassen.

@Table("accounts") 
@BelongsToParents({ 
    @BelongsTo(parent = Customer.class, foreignKeyName = "Customer"), 
    @BelongsTo(parent = Currency.class, foreignKeyName = "Currency") 
}) 
public class Account extends Document{ 
    public static DocFields prepareDocument(...){ 

    ... fields = new ...(getTableName()); 
    ... 
    } 
... 
} 

public abstract class Document extends Model{ 
    public static DocFields prepareDocument(Session session){ 
    return null; 
    } 
    ... 
} 

public class DynCLoader extends ClassLoader { 

    public DynCLoader(ClassLoader parentClass) { 
    super(parentClass); 
    } 
    @Override 
    public Class<?> loadClass(String className) throws ClassNotFoundException { 
    if(StrFuncs.isEmpty(className)){ 
     throw new ClassNotFoundException("Ошибка в модуле DynCLoader, в функцие loadClass. Детали: className is empty"); 
    } 
    try { 
     ... 
     if(...){ // Загрузка нового, неопределенного класса 
     Class<?> clazz; 
     try{ 
      String url = "file:"+...+".class"; 
      URL myUrl = new URL(url); 
      URLConnection connection = myUrl.openConnection(); 
      InputStream input = connection.getInputStream(); 
      ByteArrayOutputStream buffer = new ByteArrayOutputStream(); 
      int data = input.read(); 
      while(data != -1){ 
       buffer.write(data); 
       data = input.read(); 
      } 
      input.close(); 
      byte[] classData = buffer.toByteArray(); 
      clazz = defineClass(className, classData, 0, classData.length); 
      ... 
      return clazz; 
     } 
     catch (FileNotFoundException ex) { 
      clazz = Class.forName(className); 
      ... 
      return clazz; 
     } 
     catch (MalformedURLException ex) { 
      ... 
      return null; 
     } 
     catch (Throwable ex) { 
      try{ 
      clazz = Class.forName(className, true, this); 
      return clazz; 
      } 
      catch(ClassNotFoundException oErr){ 
      ... 
      } 
      ... 
      return null; 
     } 
     } 
     else if(...) // Загрузка системного класса 
     return Class.forName(className); 
     else{ 
     return Class.forName(className, true, this); 
     } 
    } 
    catch (ClassNotFoundException ex) { 
     throw ex; 
    } 
    } 
} 

Log:

[main] INFO org.javalite.activejdbc.DB - Opened connection: com.mysql.jdbc.JDBC4Connection@49fd9b 
[main] INFO org.javalite.activejdbc.ConnectionsAccess - Attached connection named: default: to current thread: com.mysql.jdbc.JDBC4Connection@49fd9b. Extra info: jdbc:mysql://127.0.0.1:3306/*** 
[main] INFO org.javalite.activejdbc.Configuration - Load models from: file:/***/Product/***/Server/target/classes/activejdbc_models.properties 
[main] INFO org.javalite.activejdbc.Configuration - Load models from: file:/***/Kernel/Server/target/classes/activejdbc_models.properties 
[main] INFO org.javalite.activejdbc.Registry - Registered model: class kz.mwb.qupris.server.data.model.Account 
*** 
[main] INFO org.javalite.activejdbc.Registry - Registered model: class kz.mwb.qupris.server.data.model.User 
*** 
[main] INFO org.javalite.activejdbc.Registry - Fetched metadata for table: accounts 
*** 
[main] INFO org.javalite.activejdbc.Registry - Fetched metadata for table: usertable 
*** 
[main] INFO org.javalite.activejdbc.MetaModel - Association found: Customer ----------< Account, type: has-many 
[main] INFO org.javalite.activejdbc.MetaModel - Association found: Account >---------- Customer, type: belongs-to 
*** 
[main] INFO org.javalite.activejdbc.cache.QueryCache - MISS, "SELECT * FROM *** WHERE *** 
*** 
[Thread-20] INFO org.javalite.activejdbc.DB - Opened connection: com.mysql.jdbc.JDBC4Connection@1db686 
[Thread-20] INFO org.javalite.activejdbc.ConnectionsAccess - Attached connection named: default: to current thread: com.mysql.jdbc.JDBC4Connection@1db686. Extra info: jdbc:mysql://127.0.0.1:3306/*** 
[Thread-20] INFO org.javalite.activejdbc.LazyList - Query: "SELECT * FROM *** WHERE ***, took: 5 milliseconds 
*** 
00:42:52 > 34 > UserLib > ERROR > java.lang.reflect.InvocationTargetException 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at kz.mwb.qupris.server.tool.loader.Include.processMethod(Include.java:111) 
    at kz.mwb.qupris.server.userlib.doDoc.initMod(doDoc.java:59) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at kz.mwb.qupris.server.tool.loader.Include.processMethod(Include.java:111) 
    at kz.mwb.qupris.server.tool.loader.Include.EvalFunction(Include.java:31) 
    at kz.mwb.qupris.server.engine.ModEngine.MProcess(ModEngine.java:133) 
    at kz.mwb.qupris.server.engine.ModEngine.IProcess(ModEngine.java:85) 
    at kz.mwb.qupris.server.engine.ModEngine.XProcess(ModEngine.java:203) 
    at kz.mwb.qupris.server.engine.Task.ProcessRequest(Task.java:396) 
    at kz.mwb.qupris.server.engine.Task.GateWayLine(Task.java:162) 
    at kz.mwb.qupris.server.engine.Task.ConnectToGateWay(Task.java:326) 
    at kz.mwb.qupris.server.engine.Task.run(Task.java:61) 
    at java.lang.Thread.run(Unknown Source) 
Caused by: org.javalite.activejdbc.DBException: failed to find metamodel for class kz.mwb.qupris.server.data.model.Account. Are you sure that a corresponding table exists in DB? 
    at org.javalite.activejdbc.Registry.getTableName(Registry.java:414) 
    at org.javalite.activejdbc.ModelDelegate.tableNameOf(ModelDelegate.java:326) 
    at kz.mwb.qupris.server.data.model.Account.getTableName(Account.java:2831) 
    at kz.mwb.qupris.server.data.model.Account.prepareDocument(Account.java:23) 
    ... 20 more 

Answer 1

Ich änderte getTableName in einem MetaModels.java und es funktionierte!

String getTableName(Class<? extends Model> modelClass) { 
    MetaModel mm = null; 
    for (Map.Entry<Class<? extends Model>, MetaModel> entry : metaModelsByClass.entrySet()){ 
     if(modelClass.getName().equals(entry.getKey().getName())) 
     mm = entry.getValue(); 
    } 
    return mm == null ? null : mm.getTableName(); 
} 

Original-Funktion:

String getTableName(Class<? extends Model> modelClass) { 
    MetaModel mm = metaModelsByClass.get(modelClass); 
    return mm == null ? null : mm.getTableName(); 
} 

Ich schlage vor, nicht die Klasse als Schlüssel zu verwenden oder die Auswahllogik ändern.

Answer 2

Dies war ein kleiner Fehler im Framework in Bezug auf Modelle, die von einem anderen Klassenlader geladen wurden. Das Update wurde vom Anforderer bereitgestellt, das Problem wurde erstellt: https://github.com/javalite/activejdbc/issues/570 und bereits gelöst.

Sie können die neueste Schnappschuss mit dem Update aus dem Pull-: http://repo.javalite.io/org/javalite/activejdbc/2.0-SNAPSHOT/

Dank für den Beitrag!