Problema de conexion a Base de Datos

johndi · #1 (**permalink**) 08/01/2013, 17:24

Buenas noches,

Estoy realizando una aplicación en eclipse que interactua con una base de datos de ORACLE 11g.

La conexión se realiza en el context.xml mediante la siguiente estructura:

Código XML:

Ver original<?xml version="1.0" encoding="UTF-8"?>
<Context>
<Resource auth="Container"
          type="javax.sql.DataSource" driverClassName="oracle.jdbc.driver.OracleDriver"
          url="jdbc:oracle:thin:@//localhost:1521/orcl"
          username="jdmiguel" password="jdmiguel" maxActive="200" maxIdle="100"
          maxWait="-1"/>
</Context>

Al arrancar la aplicación en modo localhost con Tomcat, funciona correctamente; sin embargo, en el momento en que realizo alguna operación de consulta a la base de datos, me salta un error en el eclipse del tipo:

ene 08, 2013 11:58:27 PM org.apache.struts.action.RequestProcessor processException
Advertencia: Unhandled Exception thrown: class java.lang.Exception
ene 08, 2013 11:58:27 PM org.apache.catalina.core.StandardWrapperValve invoke
Grave: El Servlet.service() para el servlet [action] en el contexto con ruta [/jdmiguel] lanzó la excepción [java.lang.Exception: Se ha producido un error al obtener la conexi?n a la base de datos] con causa raíz
java.lang.Exception: Se ha producido un error al obtener la conexi?n a la base de datos
at es.crc.actions.FutbolAction.consultarEquipos(Futbo lAction.java:72)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknow n Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Un known Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.struts.actions.DispatchAction.dispatchM ethod(DispatchAction.java:280)
at org.apache.struts.actions.DispatchAction.execute(D ispatchAction.java:216)
at es.crcit.general.struts.BaseDispatchAction.execute (BaseDispatchAction.java:58)
at org.apache.struts.action.RequestProcessor.processA ctionPerform(RequestProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process( RequestProcessor.java:274)
at org.apache.struts.action.ActionServlet.process(Act ionServlet.java:1482)
at org.apache.struts.action.ActionServlet.doPost(Acti onServlet.java:525)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:728)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBas e.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke( StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(A ccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invok e(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.p rocess(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnect ionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProce ssor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker( Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (Unknown Source)
at java.lang.Thread.run(Unknown Source)

No se cual puede ser la causa de la no conexión, si estoy insertando mal los datos o se me esta pasando algo...

Muchas gracias de antemano,

Juan Diego

chuidiang · #2 (**permalink**) 09/01/2013, 03:38

Hola:

Este texto "java.lang.Exception: Se ha producido un error al obtener la conexi?n a la base de datos" ¿es algo que has puesto tú al capturar una excepción?. Si es así, prueba a sacar la excpeción original, posiblemente de más información.

Se bueno.

johndi · #3 (**permalink**) 09/01/2013, 14:01

La excepción aparece en la instruccion:

con = DatabaseConnectionManager.getConnection();

Donde la clase DatabaseConnectionManager no la encuentra... Me aparece esto:

// Compiled from DatabaseConnectionManager.java (version 1.5 : 49.0, super bit)
public final class es.crcit.general.database.DatabaseConnectionManage r {

// Field descriptor #6 Ljava/lang/String;
private static final java.lang.String DEFAULT_DATASOURCE = "dataSourceName";

// Field descriptor #11 Ljava/util/Hashtable;
private static java.util.Hashtable datasources;

// Method descriptor #13 ()V
// Stack: 2, Locals: 0
static {};
0 new java.util.Hashtable [15]
3 dup
4 invokespecial java.util.Hashtable() [17]
7 putstatic es.crcit.general.database.DatabaseConnectionManage r.datasources : java.util.Hashtable [20]
10 return
Line numbers:
[pc: 0, line: 29]
[pc: 10, line: 27]

// Method descriptor #13 ()V
// Stack: 1, Locals: 1
private DatabaseConnectionManager();
0 aload_0 [this]
1 invokespecial java.lang.Object() [24]
4 return
Line numbers:
[pc: 0, line: 34]
[pc: 4, line: 35]
Local variable table:
[pc: 0, pc: 5] local: this index: 0 type: es.crcit.general.database.DatabaseConnectionManage r

// Method descriptor #28 ()Ljava/sql/Connection;
// Stack: 1, Locals: 0
public static java.sql.Connection getConnection() throws es.crcit.general.exceptions.DatabaseException;
0 ldc <String "dataSourceName"> [8]
2 invokestatic es.crcit.general.database.DatabaseConnectionManage r.getConnection(java.lang.String) : java.sql.Connection [32]
5 areturn
Line numbers:
[pc: 0, line: 45]

// Method descriptor #34 (Ljava/lang/String;)Ljava/sql/Connection;
// Stack: 2, Locals: 1
public static java.sql.Connection getConnectionUser(java.lang.String idUser) throws es.crcit.general.exceptions.DatabaseException;
0 ldc <String "dataSourceName"> [8]
2 aload_0 [idUser]
3 invokestatic es.crcit.general.database.DatabaseConnectionManage r.getConnectionUser(java.lang.String, java.lang.String) : java.sql.Connection [36]
6 areturn
Line numbers:
[pc: 0, line: 49]
Local variable table:
[pc: 0, pc: 7] local: idUser index: 0 type: java.lang.String

// Method descriptor #34 (Ljava/lang/String;)Ljava/sql/Connection;
// Stack: 4, Locals: 4
public static java.sql.Connection getConnection(java.lang.String dsName) throws es.crcit.general.exceptions.DatabaseException;
0 aconst_null
1 astore_1 [connection]
2 aconst_null
3 astore_2 [datasource]
4 aload_0 [dsName]
5 invokestatic es.crcit.general.database.DatabaseConnectionManage r.initDataSource(java.lang.String) : void [40]
8 getstatic es.crcit.general.database.DatabaseConnectionManage r.datasources : java.util.Hashtable [20]
11 aload_0 [dsName]
12 invokevirtual java.util.Hashtable.get(java.lang.Object) : java.lang.Object [44]
15 checkcast javax.sql.DataSource [48]
18 astore_2 [datasource]
19 aload_2 [datasource]
20 invokeinterface javax.sql.DataSource.getConnection() : java.sql.Connection [50] [nargs: 1]
25 astore_1 [connection]
26 aload_1 [connection]
27 iconst_0
28 invokeinterface java.sql.Connection.setAutoCommit(boolean) : void [52] [nargs: 2]
33 goto 64
36 astore_3 [sqlexception]
37 new es.crcit.general.exceptions.DatabaseException [30]
40 dup
41 ldc <String "Se ha producido un error al obtener la conexi�n a la base de datos"> [58]
43 aload_3 [sqlexception]
44 invokespecial es.crcit.general.exceptions.DatabaseException(java .lang.String, java.lang.Throwable) [60]
47 athrow
48 astore_3 [e]
49 aload_3 [e]
50 invokevirtual java.lang.Exception.printStackTrace() : void [63]
53 new es.crcit.general.exceptions.DatabaseException [30]
56 dup
57 ldc <String "Se ha producido un error al obtener la conexi�n a la base de datos"> [58]
59 aload_3 [e]
60 invokespecial es.crcit.general.exceptions.DatabaseException(java .lang.String, java.lang.Throwable) [60]
63 athrow
64 aload_1 [connection]
65 ifnonnull 78
68 new es.crcit.general.exceptions.DatabaseException [30]
71 dup
72 ldc <String "No ha sido posible obtener una conexi�n a la base de datos"> [68]
74 invokespecial es.crcit.general.exceptions.DatabaseException(java .lang.String) [70]
77 athrow
78 aload_1 [connection]
79 areturn
Exception Table:
[pc: 4, pc: 33] -> 36 when : java.sql.SQLException
[pc: 4, pc: 33] -> 48 when : java.lang.Exception
Line numbers:
[pc: 0, line: 53]
[pc: 2, line: 54]
[pc: 4, line: 56]
[pc: 8, line: 57]
[pc: 19, line: 58]
[pc: 26, line: 59]
[pc: 36, line: 62]
[pc: 37, line: 63]
[pc: 48, line: 65]
[pc: 49, line: 66]
[pc: 53, line: 67]
[pc: 64, line: 71]
[pc: 68, line: 72]
[pc: 78, line: 75]
Local variable table:
[pc: 0, pc: 80] local: dsName index: 0 type: java.lang.String
[pc: 2, pc: 80] local: connection index: 1 type: java.sql.Connection
[pc: 4, pc: 80] local: datasource index: 2 type: javax.sql.DataSource
[pc: 37, pc: 48] local: sqlexception index: 3 type: java.sql.SQLException
[pc: 49, pc: 64] local: e index: 3 type: java.lang.Exception

// Method descriptor #38 (Ljava/lang/String;Ljava/lang/String;)Ljava/sql/Connection;
// Stack: 4, Locals: 7
public static java.sql.Connection getConnectionUser(java.lang.String dsName, java.lang.String idUser) throws es.crcit.general.exceptions.DatabaseException;
0 aconst_null
1 astore_2 [connection]
2 aconst_null
3 astore_3 [datasource]
4 ldc <String "BEGIN SYS.DBMS_SESSION.SET_IDENTIFIER (?); END;"> [83]
6 invokevirtual java.lang.String.intern() : java.lang.String [85]
9 astore 4 [FIJA_CLIENT_IDENTIFIER_SQL]
11 aconst_null
12 astore 5 [callablestatement]
14 aload_0 [dsName]
15 invokestatic es.crcit.general.database.DatabaseConnectionManage r.initDataSource(java.lang.String) : void [40]
18 getstatic es.crcit.general.database.DatabaseConnectionManage r.datasources : java.util.Hashtable [20]
21 aload_0 [dsName]
22 invokevirtual java.util.Hashtable.get(java.lang.Object) : java.lang.Object [44]
25 checkcast javax.sql.DataSource [48]
28 astore_3 [datasource]
29 aload_3 [datasource]
30 invokeinterface javax.sql.DataSource.getConnection() : java.sql.Connection [50] [nargs: 1]
35 astore_2 [connection]
36 aload_2 [connection]
37 iconst_0
38 invokeinterface java.sql.Connection.setAutoCommit(boolean) : void [52] [nargs: 2]
43 aload_2 [connection]
44 aload 4 [FIJA_CLIENT_IDENTIFIER_SQL]
46 invokeinterface java.sql.Connection.prepareCall(java.lang.String) : java.sql.CallableStatement [91] [nargs: 2]
51 astore 5 [callablestatement]
53 aload 5 [callablestatement]
55 iconst_1
56 aload_1 [idUser]
57 invokeinterface java.sql.CallableStatement.setString(int, java.lang.String) : void [95] [nargs: 3]
62 aload 5 [callablestatement]
64 invokeinterface java.sql.CallableStatement.execute() : boolean [101] [nargs: 1]
69 pop
70 goto 106
73 astore 6 [sqlexception]
75 new es.crcit.general.exceptions.DatabaseException [30]
78 dup
79 ldc <String "Se ha producido un error al obtener la conexi�n a la base de datos"> [58]
81 aload 6 [sqlexception]
83 invokespecial es.crcit.general.exceptions.DatabaseException(java .lang.String, java.lang.Throwable) [60]

johndi · #4 (**permalink**) 09/01/2013, 14:01

86 athrow
87 astore 6 [e]
89 aload 6 [e]
91 invokevirtual java.lang.Exception.printStackTrace() : void [63]
94 new es.crcit.general.exceptions.DatabaseException [30]
97 dup
98 ldc <String "Se ha producido un error al obtener la conexi�n a la base de datos"> [58]
100 aload 6 [e]
102 invokespecial es.crcit.general.exceptions.DatabaseException(java .lang.String, java.lang.Throwable) [60]
105 athrow
106 aload_2 [connection]
107 ifnonnull 120
110 new es.crcit.general.exceptions.DatabaseException [30]
113 dup
114 ldc <String "No ha sido posible obtener una conexi�n a la base de datos"> [68]
116 invokespecial es.crcit.general.exceptions.DatabaseException(java .lang.String) [70]
119 athrow
120 aload_2 [connection]
121 areturn
Exception Table:
[pc: 14, pc: 70] -> 73 when : java.sql.SQLException
[pc: 14, pc: 70] -> 87 when : java.lang.Exception
Line numbers:
[pc: 0, line: 80]
[pc: 2, line: 81]
[pc: 4, line: 82]
[pc: 11, line: 83]
[pc: 14, line: 85]
[pc: 18, line: 86]
[pc: 29, line: 87]
[pc: 36, line: 88]
[pc: 43, line: 90]
[pc: 53, line: 91]
[pc: 62, line: 92]
[pc: 73, line: 94]
[pc: 75, line: 95]
[pc: 87, line: 97]
[pc: 89, line: 98]
[pc: 94, line: 99]
[pc: 106, line: 103]
[pc: 110, line: 104]
[pc: 120, line: 107]
Local variable table:
[pc: 0, pc: 122] local: dsName index: 0 type: java.lang.String
[pc: 0, pc: 122] local: idUser index: 1 type: java.lang.String
[pc: 2, pc: 122] local: connection index: 2 type: java.sql.Connection
[pc: 4, pc: 122] local: datasource index: 3 type: javax.sql.DataSource
[pc: 11, pc: 122] local: FIJA_CLIENT_IDENTIFIER_SQL index: 4 type: java.lang.String
[pc: 14, pc: 122] local: callablestatement index: 5 type: java.sql.CallableStatement
[pc: 75, pc: 87] local: sqlexception index: 6 type: java.sql.SQLException
[pc: 89, pc: 106] local: e index: 6 type: java.lang.Exception

// Method descriptor #109 (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/sql/Connection;
// Stack: 4, Locals: 3
public static java.sql.Connection getConnectionOracle(java.lang.String urlJDBC, java.lang.String user, java.lang.String pwd) throws es.crcit.general.exceptions.DatabaseException;
0 aload_0 [urlJDBC]
1 ldc <String "oracle.jdbc.driver.OracleDriver"> [110]
3 aload_1 [user]
4 aload_2 [pwd]
5 invokestatic es.crcit.general.database.DatabaseConnectionManage r.getConnection(java.lang.String, java.lang.String, java.lang.String, java.lang.String) : java.sql.Connection [112]
8 areturn
Line numbers:
[pc: 0, line: 112]
Local variable table:
[pc: 0, pc: 9] local: urlJDBC index: 0 type: java.lang.String
[pc: 0, pc: 9] local: user index: 1 type: java.lang.String
[pc: 0, pc: 9] local: pwd index: 2 type: java.lang.String
// Method descriptor #114 (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Ljava/sql/Connection;
// Stack: 4, Locals: 6
public static java.sql.Connection getConnection(java.lang.String urlJDBC, java.lang.String driver, java.lang.String user, java.lang.String pwd) throws es.crcit.general.exceptions.DatabaseException;
0 aconst_null
1 astore 4 [connection]
3 aload_1 [driver]
4 invokestatic java.lang.Class.forName(java.lang.String) : java.lang.Class [118]
7 pop
8 aload_0 [urlJDBC]
9 aload_2 [user]
10 aload_3 [pwd]
11 invokestatic java.sql.DriverManager.getConnection(java.lang.Str ing, java.lang.String, java.lang.String) : java.sql.Connection [124]
14 astore 4 [connection]
16 aload 4 [connection]
18 iconst_0
19 invokeinterface java.sql.Connection.setAutoCommit(boolean) : void [52] [nargs: 2]
24 goto 84
27 astore 5 [sqle]
29 aload 5 [sqle]
31 invokevirtual java.sql.SQLException.printStackTrace() : void [128]
34 new es.crcit.general.exceptions.DatabaseException [30]
37 dup
38 ldc <String "Se ha producido un error al obtener la conexi�n a la base de datos"> [58]
40 aload 5 [sqle]
42 invokespecial es.crcit.general.exceptions.DatabaseException(java .lang.String, java.lang.Throwable) [60]
45 athrow
46 astore 5 [ex]
48 aload 5 [ex]
50 invokevirtual java.lang.ClassNotFoundException.printStackTrace() : void [129]
53 new es.crcit.general.exceptions.DatabaseException [30]
56 dup
57 ldc <String "Se ha producido un error al obtener la conexi�n a la base de datos. Driver no encontrado"> [132]
59 aload 5 [ex]
61 invokespecial es.crcit.general.exceptions.DatabaseException(java .lang.String, java.lang.Throwable) [60]
64 athrow
65 astore 5 [e]
67 aload 5 [e]
69 invokevirtual java.lang.Exception.printStackTrace() : void [63]
72 new es.crcit.general.exceptions.DatabaseException [30]
75 dup
76 ldc <String "Se ha producido un error al obtener la conexi�n a la base de datos"> [58]
78 aload 5 [e]
80 invokespecial es.crcit.general.exceptions.DatabaseException(java .lang.String, java.lang.Throwable) [60]
83 athrow
84 aload 4 [connection]
86 ifnonnull 99
89 new es.crcit.general.exceptions.DatabaseException [30]
92 dup
93 ldc <String "No ha sido posible obtener una conexi�n a la base de datos"> [68]
95 invokespecial es.crcit.general.exceptions.DatabaseException(java .lang.String) [70]
98 athrow
99 aload 4 [connection]
101 areturn
Exception Table:
[pc: 3, pc: 24] -> 27 when : java.sql.SQLException
[pc: 3, pc: 24] -> 46 when : java.lang.ClassNotFoundException
[pc: 3, pc: 24] -> 65 when : java.lang.Exception
Line numbers:
[pc: 0, line: 116]
[pc: 3, line: 118]
[pc: 8, line: 120]
[pc: 16, line: 121]
[pc: 27, line: 123]
[pc: 29, line: 124]
[pc: 34, line: 125]
[pc: 46, line: 127]
[pc: 48, line: 128]
[pc: 53, line: 129]
[pc: 65, line: 131]
[pc: 67, line: 132]
[pc: 72, line: 133]
[pc: 84, line: 137]
[pc: 89, line: 138]
[pc: 99, line: 141]
Local variable table:
[pc: 0, pc: 102] local: urlJDBC index: 0 type: java.lang.String
[pc: 0, pc: 102] local: driver index: 1 type: java.lang.String
[pc: 0, pc: 102] local: user index: 2 type: java.lang.String
[pc: 0, pc: 102] local: pwd index: 3 type: java.lang.String
[pc: 3, pc: 102] local: connection index: 4 type: java.sql.Connection
[pc: 29, pc: 46] local: sqle index: 5 type: java.sql.SQLException
[pc: 48, pc: 65] local: ex index: 5 type: java.lang.ClassNotFoundException
[pc: 67, pc: 84] local: e index: 5 type: java.lang.Exception

// Method descriptor #139 (Ljava/sql/Connection;)V
// Stack: 1, Locals: 2
public static void closeConnection(java.sql.Connection connection);
0 aload_0 [connection]
1 ifnull 14
4 aload_0 [connection]
5 invokeinterface java.sql.Connection.close() : void [140] [nargs: 1]
10 goto 14
13 astore_1
14 return
Exception Table:
[pc: 4, pc: 10] -> 13 when : java.sql.SQLException
Line numbers:
[pc: 0, line: 154]
[pc: 4, line: 156]
[pc: 13, line: 158]
[pc: 14, line: 160]
Local variable table:
[pc: 0, pc: 15] local: connection index: 0 type: java.sql.Connection

// Method descriptor #13 ()V
// Stack: 1, Locals: 0
private static synchronized void initDataSource() throws java.sql.SQLException;
0 ldc <String "dataSourceName"> [8]
2 invokestatic es.crcit.general.database.DatabaseConnectionManage r.initDataSource(java.lang.String) : void [40]
5 return
Line numbers:
[pc: 0, line: 170]
[pc: 5, line: 171]

johndi · #5 (**permalink**) 09/01/2013, 14:02

// Method descriptor #43 (Ljava/lang/String;)V
// Stack: 3, Locals: 5
private static synchronized void initDataSource(java.lang.String datasourceName) throws java.sql.SQLException;
0 getstatic es.crcit.general.database.DatabaseConnectionManage r.datasources : java.util.Hashtable [20]
3 aload_0 [datasourceName]
4 invokevirtual java.util.Hashtable.get(java.lang.Object) : java.lang.Object [44]
7 ifnonnull 74
10 aconst_null
11 astore_1 [datasource]
12 aload_0 [datasourceName]
13 invokestatic es.crcit.general.configuracion.Configuracion.getPr opiedad(java.lang.String) : java.lang.String [143]
16 astore_3 [dsName]
17 new java.util.Properties [149]
20 dup
21 invokespecial java.util.Properties() [151]
24 astore 4 [env]
26 new javax.naming.InitialContext [152]
29 dup
30 aload 4 [env]
32 invokespecial javax.naming.InitialContext(java.util.Hashtable) [154]
35 astore_2 [ctx]
36 aload_2 [ctx]
37 aload_3 [dsName]
38 invokeinterface javax.naming.Context.lookup(java.lang.String) : java.lang.Object [157] [nargs: 2]
43 checkcast javax.sql.DataSource [48]
46 astore_1 [datasource]
47 getstatic es.crcit.general.database.DatabaseConnectionManage r.datasources : java.util.Hashtable [20]
50 aload_0 [datasourceName]
51 aload_1 [datasource]
52 invokevirtual java.util.Hashtable.put(java.lang.Object, java.lang.Object) : java.lang.Object [163]
55 pop
56 goto 74
59 astore 4 [namingexception]
61 new java.sql.SQLException [72]
64 dup
65 aload 4 [namingexception]
67 invokevirtual javax.naming.NamingException.getExplanation() : java.lang.String [167]
70 invokespecial java.sql.SQLException(java.lang.String) [172]
73 athrow
74 return
Exception Table:
[pc: 17, pc: 56] -> 59 when : javax.naming.NamingException
Line numbers:
[pc: 0, line: 174]
[pc: 10, line: 175]
[pc: 12, line: 177]
[pc: 17, line: 180]
[pc: 26, line: 181]
[pc: 36, line: 182]
[pc: 47, line: 183]
[pc: 59, line: 186]
[pc: 61, line: 187]
[pc: 74, line: 190]
Local variable table:
[pc: 0, pc: 75] local: datasourceName index: 0 type: java.lang.String
[pc: 12, pc: 74] local: datasource index: 1 type: javax.sql.DataSource
[pc: 36, pc: 59] local: ctx index: 2 type: javax.naming.Context
[pc: 17, pc: 74] local: dsName index: 3 type: java.lang.String
[pc: 26, pc: 59] local: env index: 4 type: java.util.Properties
[pc: 61, pc: 74] local: namingexception index: 4 type: javax.naming.NamingException
}

Además, acabo de mirar que el javadoc path no está puesto, pero no sé donde encontrarlo...

chuidiang · #6 (**permalink**) 09/01/2013, 14:35

¿Y la excepción exactamente es? ¿Que no encuentra la clase?