Boas Práticas – Dica nº 1
04/setembro/2010 - Java
Bom dia,
Ter um blog não é nada fácil, este aqui por exemplo está abandonado já faz quase um mês. A maior dificuldade é encontrar assuntos pra postar. Por isso tive uma idéia, postar uma série de dicas de boas práticas de codificação.
A idéia é mostrar com dicas simples como melhorar o código, evitando erros e melhorando a codificação.
Nesta primeira dica, mostrarei como evitar um NullPointerException toda vez em que fazemos uma comparação com objetos com uma constante. Muita gente já conhece essa técnica, principalmente os mais experientes, mas nunca é demais lembrar.
A dica é: Sempre coloque a constante à esquerda (ou o objeto que você terá certeza que não estará nulo) da condição.
Veja o exemplo abaixo:
public boolean validar(String result) {
if ("OK".equals(result)) {
return true;
} else {
return false;
}
}
O código acima compara o parâmetro result com a constante OK que está a esquerda da condição.
Se result for nulo o método retornará false.
Já dei manutenção em código que estava assim:
public boolean validar(String result) {
if (result == null) {
result = "";
}
if ("OK".equals(result)) {
return true;
} else {
return false;
}
}
Percebam que colocaram um if desnecessário só para atribuir uma string vazia ao parâmetro, afim de evitar o NullPointerException no próximo if. Além de ser feio fazer atribuições aos parâmetros, aumenta a complexidade de uma futura manutenção.
Por hoje é só.
Até mais,
Roberto
Simplificando cálculos com datas com Joda Time – Java
21/fevereiro/2010 - Java
Olá!
Quem precisou fazer contas com java.util.Date ou java.util.Calendar saber o trabalho que dá e como a API nativa do Java (até o Java 6 pelo menos) não ajuda muito a fazer coisas simples como adicionar horas na data atual. A API Joda Time veio para simplificar o trabalho com datas no Java, tanto é que muitas idéias dessa API tem grande chance de estarem no Java 7 através da JSR-310.
O que eu mais gostei do Joda Time são os método toString() que aceitam como parâmetro o padrão de formatação (não preciso criar mais SimpleDateFormat para formatar os benditos java.util.Date!!! parecido com o do C#), inicialização do objeto com String e o uso de interfaces fluentes.
Abaixo exemplos de uso.
- Inicialização do objeto com String
DateTime date = new DateTime("2010-2-21T20:19:45.000-03:00");
System.out.println(date.toString("dd/MM/yyyy HH:mm:ss"));
- Soma de dias escolhendo o ano
LocalDate localDate = new LocalDate();
LocalDate moreDays = localDate.withYear(2008).plusDays(8);
System.out.println(moreDays.toString("dd/MM/yyyy"));
// 29/02/2008
- Dia da semana por extenso
DateTime dateTime = new DateTime(); String dayOfMonth = dateTime.dayOfWeek().getAsText(); System.out.println(dayOfMonth); // Domingo
- Quantidade de dias entre um dia e outro
DateTime inicio = new DateTime(2010, 2, 21, 0, 0, 0, 0); DateTime fim = new DateTime(2010, 2, 22, 13, 30, 0, 0); System.out.println(Days.daysBetween(inicio, fim).getDays()); // 1 System.out.println(Hours.hoursBetween(inicio, fim).getHours()); // 37 System.out.println(Minutes.minutesBetween(inicio, fim).getMinutes()); // 2250
- Diferença de horas entre fusos horários.
DateTime agora = new DateTime();
DateTime saoPaulo =
agora.withZoneRetainFields(DateTimeZone.forID("America/Sao_Paulo"));
DateTime rioBranco =
agora.withZoneRetainFields(DateTimeZone.forID("America/Rio_Branco"));
DateTime japao =
agora.withZoneRetainFields(DateTimeZone.forID("Asia/Tokyo"));
DateTime londres =
agora.withZoneRetainFields(DateTimeZone.forID("Europe/London"));
System.out.println(Hours.hoursBetween(japao, saoPaulo).getHours());
System.out.println(Hours.hoursBetween(londres, saoPaulo).getHours());
System.out.println(Hours.hoursBetween(rioBranco, saoPaulo).getHours());
// Diferença de horas entre Japão e São Paulo: 12
// Diferença de horas entre Londre e São Paulo: 3
// Diferença de horas entre Rio Branco/AC e São Paulo: -1
Até mais,
Roberto
Alterando a saída do System.out.println()
13/dezembro/2009 - Java
Olá!
Quando criamos um programa em java e queremos mostrar alguma mensagem no console usamos inconscientemente o System.out.println(), mas e para gravar essas mesmas mensagens em um arquivo texto? Muito simples, basta dar um System.setOut() passando o PrintStream desejado. No exemplo abaixo alteramos a saída padrão, que era no console, para um arquivo texto.
String path = "D:\\saida.txt";
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream(path);
System.setOut(new PrintStream(fileOutputStream, true));
System.out.println("Teste");
} catch (FileNotFoundException e) {
e.printStackTrace();
}
Até mais
Roberto
Exemplo de Message Driven Bean
13/novembro/2009 - Java
Olá!
Faz tempo que eu não posto nada no blog, então hoje vou deixar um exemplo bem simples de serviço de mensageria JMS.
JMS – Java Messaging Service é uma arquitetura existente no universo J2EE que permite troca de mensagens de maneira assíncrona.
Este exemplo consiste em duas classes, Main que envia um MDB (Message Drive Bean) e a JMSProcessBean que recebe a mensagem e exibe no console o valor do atributo “nome”.
No projeto JMSTester verificar se as bibliotecas abaixos estão corretamente referenciadas. Utilizei a instalação padrão do netbeans 6.7.1 e do glassfish v2.1.
C:\Sun\AppServer\lib\appserv-admin.jar
C:\Sun\AppServer\lib\appserv-rt.jar
C:\Sun\AppServer\imq\lib\imq.jar
C:\Sun\AppServer\lib\install\applications\jmsra\imqjmsra.jar
C:\Sun\AppServer\lib\j2ee.jar
C:\Sun\AppServer\lib\install\applications\jaxr-ra\jaxr-ra.jar
C:\Sun\AppServer\imq\lib\jms.jar
Na administração do Glassfish é possível verificar se o JMS foi corretamente implantado.
Ao executar a classe Main teremos a saída abaixo (observe a última linha):
run:
13/11/2009 23:10:58 com.sun.appserv.naming.RoundRobinPolicy setClusterInstanceInfo
WARNING: NAM1005 : No Endpoints selected. Please specify using system property com.sun.appserv.iiop.endpoints.
13/11/2009 23:10:58 com.sun.appserv.naming.RoundRobinPolicy getEndpointForProviderURL
WARNING: NAM1001: No Endpoints selected in com.sun.appserv.iiop.endpoints property. Using JNDI Provider URL iiop://127.0.0.1:3700 instead
13/11/2009 23:10:59 com.sun.appserv.naming.RoundRobinPolicy setClusterInstanceInfo
INFO: endpoint.weight after checking isWeight = 10
13/11/2009 23:10:59 com.sun.appserv.naming.RoundRobinPolicy setClusterInstanceInfo
INFO: sumOfAllWeights = 10
13/11/2009 23:10:59 com.sun.appserv.naming.S1ASCtxFactory getCorbalocURL
INFO: list[i] ==> 127.0.0.1:3700
13/11/2009 23:10:59 com.sun.appserv.naming.S1ASCtxFactory getCorbalocURL
INFO: corbaloc url ==> iiop:1.2@127.0.0.1:3700
13/11/2009 23:11:00 com.sun.messaging.jms.ra.ResourceAdapter start
INFO: MQJMSRA_RA1101: SJSMQ JMS Resource Adapter starting…
13/11/2009 23:11:00 com.sun.messaging.jms.ra.ResourceAdapter start
INFO: MQJMSRA_RA1101: SJSMQ JMSRA Started:REMOTE
13/11/2009 23:11:00 com.sun.messaging.jms.ra.ManagedConnectionFactory setAddressList
INFO: MQJMSRA_MF1101: setAddressList:NOT setting default value=localhost
13/11/2009 23:11:00 com.sun.messaging.jms.ra.ManagedConnectionFactory setPassword
INFO: MQJMSRA_MF1101: setPassword:NOT setting default value
13/11/2009 23:11:00 com.sun.messaging.jms.ra.ManagedConnectionFactory setUserName
INFO: MQJMSRA_MF1101: setUserName:NOT setting default value=guest
13/11/2009 23:11:01 com.sun.messaging.jms.ra.ManagedConnection <init>
INFO: MQJMSRA_MC1101: constructor:Created mcId=1:xacId=6281999144483361280:Using xacf config={imqOverrideJMSPriority=false, imqConsumerFlowLimit=1000, imqOverrideJMSExpiration=false, imqAddressListIterations=3, imqLoadMaxToServerSession=true, imqConnectionType=TCP, imqPingInterval=30, imqSetJMSXUserID=false, imqConfiguredClientID=, imqSSLProviderClassname=com.sun.net.ssl.internal.ssl.Provider, imqJMSDeliveryMode=PERSISTENT, imqConnectionFlowLimit=1000, imqConnectionURL=http://localhost/imq/tunnel, imqBrokerServiceName=, imqJMSPriority=4, imqBrokerHostName=localhost, imqJMSExpiration=0, imqAckOnProduce=, imqEnableSharedClientID=false, imqAckTimeout=0, imqAckOnAcknowledge=, imqConsumerFlowThreshold=50, imqDefaultPassword=guest, imqQueueBrowserMaxMessagesPerRetrieve=1000, imqDefaultUsername=guest, imqReconnectEnabled=true, imqConnectionFlowCount=100, imqAddressListBehavior=RANDOM, imqReconnectAttempts=3, imqSetJMSXAppID=false, imqConnectionHandler=com.sun.messaging.jmq.jmsclient.protocol.tcp.TCPStreamHandler, imqSetJMSXRcvTimestamp=false, imqBrokerServicePort=0, imqDisableSetClientID=false, imqSetJMSXConsumerTXID=false, imqOverrideJMSDeliveryMode=false, imqBrokerHostPort=7676, imqQueueBrowserRetrieveTimeout=60000, imqSetJMSXProducerTXID=false, imqSSLIsHostTrusted=false, imqConnectionFlowLimitEnabled=false, imqReconnectInterval=5000, imqAddressList=mq://Furutani:7676/, imqOverrideJMSHeadersToTemporaryDestinations=false}
13/11/2009 23:11:01 com.sun.messaging.jms.ra.ManagedConnection <init>
INFO: MQJMSRA_MC1101: constructor:Created mcId=2:xacId=6281999144483371776:Using xacf config={imqOverrideJMSPriority=false, imqConsumerFlowLimit=1000, imqOverrideJMSExpiration=false, imqAddressListIterations=3, imqLoadMaxToServerSession=true, imqConnectionType=TCP, imqPingInterval=30, imqSetJMSXUserID=false, imqConfiguredClientID=, imqSSLProviderClassname=com.sun.net.ssl.internal.ssl.Provider, imqJMSDeliveryMode=PERSISTENT, imqConnectionFlowLimit=1000, imqConnectionURL=http://localhost/imq/tunnel, imqBrokerServiceName=, imqJMSPriority=4, imqBrokerHostName=localhost, imqJMSExpiration=0, imqAckOnProduce=, imqEnableSharedClientID=false, imqAckTimeout=0, imqAckOnAcknowledge=, imqConsumerFlowThreshold=50, imqDefaultPassword=guest, imqQueueBrowserMaxMessagesPerRetrieve=1000, imqDefaultUsername=guest, imqReconnectEnabled=true, imqConnectionFlowCount=100, imqAddressListBehavior=RANDOM, imqReconnectAttempts=3, imqSetJMSXAppID=false, imqConnectionHandler=com.sun.messaging.jmq.jmsclient.protocol.tcp.TCPStreamHandler, imqSetJMSXRcvTimestamp=false, imqBrokerServicePort=0, imqDisableSetClientID=false, imqSetJMSXConsumerTXID=false, imqOverrideJMSDeliveryMode=false, imqBrokerHostPort=7676, imqQueueBrowserRetrieveTimeout=60000, imqSetJMSXProducerTXID=false, imqSSLIsHostTrusted=false, imqConnectionFlowLimitEnabled=false, imqReconnectInterval=5000, imqAddressList=mq://Furutani:7676/, imqOverrideJMSHeadersToTemporaryDestinations=false}
13/11/2009 23:11:01 com.sun.messaging.jms.ra.ManagedConnection <init>
INFO: MQJMSRA_MC1101: constructor:Created mcId=3:xacId=6281999144483379200:Using xacf config={imqOverrideJMSPriority=false, imqConsumerFlowLimit=1000, imqOverrideJMSExpiration=false, imqAddressListIterations=3, imqLoadMaxToServerSession=true, imqConnectionType=TCP, imqPingInterval=30, imqSetJMSXUserID=false, imqConfiguredClientID=, imqSSLProviderClassname=com.sun.net.ssl.internal.ssl.Provider, imqJMSDeliveryMode=PERSISTENT, imqConnectionFlowLimit=1000, imqConnectionURL=http://localhost/imq/tunnel, imqBrokerServiceName=, imqJMSPriority=4, imqBrokerHostName=localhost, imqJMSExpiration=0, imqAckOnProduce=, imqEnableSharedClientID=false, imqAckTimeout=0, imqAckOnAcknowledge=, imqConsumerFlowThreshold=50, imqDefaultPassword=guest, imqQueueBrowserMaxMessagesPerRetrieve=1000, imqDefaultUsername=guest, imqReconnectEnabled=true, imqConnectionFlowCount=100, imqAddressListBehavior=RANDOM, imqReconnectAttempts=3, imqSetJMSXAppID=false, imqConnectionHandler=com.sun.messaging.jmq.jmsclient.protocol.tcp.TCPStreamHandler, imqSetJMSXRcvTimestamp=false, imqBrokerServicePort=0, imqDisableSetClientID=false, imqSetJMSXConsumerTXID=false, imqOverrideJMSDeliveryMode=false, imqBrokerHostPort=7676, imqQueueBrowserRetrieveTimeout=60000, imqSetJMSXProducerTXID=false, imqSSLIsHostTrusted=false, imqConnectionFlowLimitEnabled=false, imqReconnectInterval=5000, imqAddressList=mq://Furutani:7676/, imqOverrideJMSHeadersToTemporaryDestinations=false}
13/11/2009 23:11:01 com.sun.messaging.jms.ra.ManagedConnection <init>
INFO: MQJMSRA_MC1101: constructor:Created mcId=4:xacId=6281999144483388416:Using xacf config={imqOverrideJMSPriority=false, imqConsumerFlowLimit=1000, imqOverrideJMSExpiration=false, imqAddressListIterations=3, imqLoadMaxToServerSession=true, imqConnectionType=TCP, imqPingInterval=30, imqSetJMSXUserID=false, imqConfiguredClientID=, imqSSLProviderClassname=com.sun.net.ssl.internal.ssl.Provider, imqJMSDeliveryMode=PERSISTENT, imqConnectionFlowLimit=1000, imqConnectionURL=http://localhost/imq/tunnel, imqBrokerServiceName=, imqJMSPriority=4, imqBrokerHostName=localhost, imqJMSExpiration=0, imqAckOnProduce=, imqEnableSharedClientID=false, imqAckTimeout=0, imqAckOnAcknowledge=, imqConsumerFlowThreshold=50, imqDefaultPassword=guest, imqQueueBrowserMaxMessagesPerRetrieve=1000, imqDefaultUsername=guest, imqReconnectEnabled=true, imqConnectionFlowCount=100, imqAddressListBehavior=RANDOM, imqReconnectAttempts=3, imqSetJMSXAppID=false, imqConnectionHandler=com.sun.messaging.jmq.jmsclient.protocol.tcp.TCPStreamHandler, imqSetJMSXRcvTimestamp=false, imqBrokerServicePort=0, imqDisableSetClientID=false, imqSetJMSXConsumerTXID=false, imqOverrideJMSDeliveryMode=false, imqBrokerHostPort=7676, imqQueueBrowserRetrieveTimeout=60000, imqSetJMSXProducerTXID=false, imqSSLIsHostTrusted=false, imqConnectionFlowLimitEnabled=false, imqReconnectInterval=5000, imqAddressList=mq://Furutani:7676/, imqOverrideJMSHeadersToTemporaryDestinations=false}
13/11/2009 23:11:01 com.sun.messaging.jms.ra.ManagedConnection <init>
INFO: MQJMSRA_MC1101: constructor:Created mcId=5:xacId=6281999144483394816:Using xacf config={imqOverrideJMSPriority=false, imqConsumerFlowLimit=1000, imqOverrideJMSExpiration=false, imqAddressListIterations=3, imqLoadMaxToServerSession=true, imqConnectionType=TCP, imqPingInterval=30, imqSetJMSXUserID=false, imqConfiguredClientID=, imqSSLProviderClassname=com.sun.net.ssl.internal.ssl.Provider, imqJMSDeliveryMode=PERSISTENT, imqConnectionFlowLimit=1000, imqConnectionURL=http://localhost/imq/tunnel, imqBrokerServiceName=, imqJMSPriority=4, imqBrokerHostName=localhost, imqJMSExpiration=0, imqAckOnProduce=, imqEnableSharedClientID=false, imqAckTimeout=0, imqAckOnAcknowledge=, imqConsumerFlowThreshold=50, imqDefaultPassword=guest, imqQueueBrowserMaxMessagesPerRetrieve=1000, imqDefaultUsername=guest, imqReconnectEnabled=true, imqConnectionFlowCount=100, imqAddressListBehavior=RANDOM, imqReconnectAttempts=3, imqSetJMSXAppID=false, imqConnectionHandler=com.sun.messaging.jmq.jmsclient.protocol.tcp.TCPStreamHandler, imqSetJMSXRcvTimestamp=false, imqBrokerServicePort=0, imqDisableSetClientID=false, imqSetJMSXConsumerTXID=false, imqOverrideJMSDeliveryMode=false, imqBrokerHostPort=7676, imqQueueBrowserRetrieveTimeout=60000, imqSetJMSXProducerTXID=false, imqSSLIsHostTrusted=false, imqConnectionFlowLimitEnabled=false, imqReconnectInterval=5000, imqAddressList=mq://Furutani:7676/, imqOverrideJMSHeadersToTemporaryDestinations=false}
13/11/2009 23:11:01 com.sun.messaging.jms.ra.ManagedConnection <init>
INFO: MQJMSRA_MC1101: constructor:Created mcId=6:xacId=6281999144483402752:Using xacf config={imqOverrideJMSPriority=false, imqConsumerFlowLimit=1000, imqOverrideJMSExpiration=false, imqAddressListIterations=3, imqLoadMaxToServerSession=true, imqConnectionType=TCP, imqPingInterval=30, imqSetJMSXUserID=false, imqConfiguredClientID=, imqSSLProviderClassname=com.sun.net.ssl.internal.ssl.Provider, imqJMSDeliveryMode=PERSISTENT, imqConnectionFlowLimit=1000, imqConnectionURL=http://localhost/imq/tunnel, imqBrokerServiceName=, imqJMSPriority=4, imqBrokerHostName=localhost, imqJMSExpiration=0, imqAckOnProduce=, imqEnableSharedClientID=false, imqAckTimeout=0, imqAckOnAcknowledge=, imqConsumerFlowThreshold=50, imqDefaultPassword=guest, imqQueueBrowserMaxMessagesPerRetrieve=1000, imqDefaultUsername=guest, imqReconnectEnabled=true, imqConnectionFlowCount=100, imqAddressListBehavior=RANDOM, imqReconnectAttempts=3, imqSetJMSXAppID=false, imqConnectionHandler=com.sun.messaging.jmq.jmsclient.protocol.tcp.TCPStreamHandler, imqSetJMSXRcvTimestamp=false, imqBrokerServicePort=0, imqDisableSetClientID=false, imqSetJMSXConsumerTXID=false, imqOverrideJMSDeliveryMode=false, imqBrokerHostPort=7676, imqQueueBrowserRetrieveTimeout=60000, imqSetJMSXProducerTXID=false, imqSSLIsHostTrusted=false, imqConnectionFlowLimitEnabled=false, imqReconnectInterval=5000, imqAddressList=mq://Furutani:7676/, imqOverrideJMSHeadersToTemporaryDestinations=false}
13/11/2009 23:11:01 com.sun.messaging.jms.ra.ManagedConnection <init>
INFO: MQJMSRA_MC1101: constructor:Created mcId=7:xacId=6281999144483408896:Using xacf config={imqOverrideJMSPriority=false, imqConsumerFlowLimit=1000, imqOverrideJMSExpiration=false, imqAddressListIterations=3, imqLoadMaxToServerSession=true, imqConnectionType=TCP, imqPingInterval=30, imqSetJMSXUserID=false, imqConfiguredClientID=, imqSSLProviderClassname=com.sun.net.ssl.internal.ssl.Provider, imqJMSDeliveryMode=PERSISTENT, imqConnectionFlowLimit=1000, imqConnectionURL=http://localhost/imq/tunnel, imqBrokerServiceName=, imqJMSPriority=4, imqBrokerHostName=localhost, imqJMSExpiration=0, imqAckOnProduce=, imqEnableSharedClientID=false, imqAckTimeout=0, imqAckOnAcknowledge=, imqConsumerFlowThreshold=50, imqDefaultPassword=guest, imqQueueBrowserMaxMessagesPerRetrieve=1000, imqDefaultUsername=guest, imqReconnectEnabled=true, imqConnectionFlowCount=100, imqAddressListBehavior=RANDOM, imqReconnectAttempts=3, imqSetJMSXAppID=false, imqConnectionHandler=com.sun.messaging.jmq.jmsclient.protocol.tcp.TCPStreamHandler, imqSetJMSXRcvTimestamp=false, imqBrokerServicePort=0, imqDisableSetClientID=false, imqSetJMSXConsumerTXID=false, imqOverrideJMSDeliveryMode=false, imqBrokerHostPort=7676, imqQueueBrowserRetrieveTimeout=60000, imqSetJMSXProducerTXID=false, imqSSLIsHostTrusted=false, imqConnectionFlowLimitEnabled=false, imqReconnectInterval=5000, imqAddressList=mq://Furutani:7676/, imqOverrideJMSHeadersToTemporaryDestinations=false}
13/11/2009 23:11:01 com.sun.messaging.jms.ra.ManagedConnection <init>
INFO: MQJMSRA_MC1101: constructor:Created mcId=8:xacId=6281999144483415808:Using xacf config={imqOverrideJMSPriority=false, imqConsumerFlowLimit=1000, imqOverrideJMSExpiration=false, imqAddressListIterations=3, imqLoadMaxToServerSession=true, imqConnectionType=TCP, imqPingInterval=30, imqSetJMSXUserID=false, imqConfiguredClientID=, imqSSLProviderClassname=com.sun.net.ssl.internal.ssl.Provider, imqJMSDeliveryMode=PERSISTENT, imqConnectionFlowLimit=1000, imqConnectionURL=http://localhost/imq/tunnel, imqBrokerServiceName=, imqJMSPriority=4, imqBrokerHostName=localhost, imqJMSExpiration=0, imqAckOnProduce=, imqEnableSharedClientID=false, imqAckTimeout=0, imqAckOnAcknowledge=, imqConsumerFlowThreshold=50, imqDefaultPassword=guest, imqQueueBrowserMaxMessagesPerRetrieve=1000, imqDefaultUsername=guest, imqReconnectEnabled=true, imqConnectionFlowCount=100, imqAddressListBehavior=RANDOM, imqReconnectAttempts=3, imqSetJMSXAppID=false, imqConnectionHandler=com.sun.messaging.jmq.jmsclient.protocol.tcp.TCPStreamHandler, imqSetJMSXRcvTimestamp=false, imqBrokerServicePort=0, imqDisableSetClientID=false, imqSetJMSXConsumerTXID=false, imqOverrideJMSDeliveryMode=false, imqBrokerHostPort=7676, imqQueueBrowserRetrieveTimeout=60000, imqSetJMSXProducerTXID=false, imqSSLIsHostTrusted=false, imqConnectionFlowLimitEnabled=false, imqReconnectInterval=5000, imqAddressList=mq://Furutani:7676/, imqOverrideJMSHeadersToTemporaryDestinations=false}
Mensagens enviadas!
No console do Glassfish v2.1 teremos a seguinte saída:
13/11/2009 23:08:51 com.sun.enterprise.admin.servermgmt.launch.ASLauncher buildCommand
INFO:
C:/Program Files/Java/jdk1.6.0_11\bin\java
-Dcom.sun.aas.instanceRoot=C:/Sun/AppServer/domains/domain1
-Dcom.sun.aas.ClassPathPrefix=
-Dcom.sun.aas.ClassPathSuffix=
-Dcom.sun.aas.ServerClassPath=
-Dcom.sun.aas.classloader.appserverChainJars.ee=
-Dcom.sun.aas.classloader.appserverChainJars=admin-cli.jar,admin-cli-ee.jar,j2ee-svc.jar
-Dcom.sun.aas.classloader.excludesList=admin-cli.jar,appserv-upgrade.jar,sun-appserv-ant.jar
-Dcom.sun.aas.classloader.optionalOverrideableChain.ee=
-Dcom.sun.aas.classloader.optionalOverrideableChain=webservices-rt.jar,webservices-tools.jar
-Dcom.sun.aas.classloader.serverClassPath.ee=Does not exist/lib/hadbjdbc4.jar,C:/Sun/AppServer/lib/SUNWjdmk/5.1/lib/jdmkrt.jar,Does not exist/lib/dbstate.jar,Does not exist/lib/hadbm.jar,Does not exist/lib/hadbmgt.jar,C:/Sun/AppServer/lib/SUNWmfwk/lib/mfwk_instrum_tk.jar
-Dcom.sun.aas.classloader.serverClassPath=C:/Sun/AppServer/lib/install/applications/jmsra/imqjmsra.jar,C:/Sun/AppServer/imq/lib/jaxm-api.jar,C:/Sun/AppServer/imq/lib/fscontext.jar,C:/Sun/AppServer/imq/lib/imqbroker.jar,C:/Sun/AppServer/imq/lib/imqjmx.jar,C:/Sun/AppServer/lib/ant/lib/ant.jar,C:/Sun/AppServer/lib/SUNWjdmk/5.1/lib/jdmkrt.jar
-Dcom.sun.aas.classloader.sharedChainJars.ee=appserv-se.jar,appserv-ee.jar,jesmf-plugin.jar,Does not exist/lib/dbstate.jar,Does not exist/lib/hadbjdbc4.jar,jgroups-all.jar,C:/Sun/AppServer/lib/SUNWmfwk/lib/mfwk_instrum_tk.jar
-Dcom.sun.aas.classloader.sharedChainJars=javaee.jar,C:/Program Files/Java/jdk1.6.0_11/lib/tools.jar,install/applications/jmsra/imqjmsra.jar,com-sun-commons-launcher.jar,com-sun-commons-logging.jar,C:/Sun/AppServer/imq/lib/jaxm-api.jar,C:/Sun/AppServer/imq/lib/fscontext.jar,C:/Sun/AppServer/imq/lib/imqbroker.jar,C:/Sun/AppServer/imq/lib/imqjmx.jar,C:/Sun/AppServer/imq/lib/imqxm.jar,webservices-rt.jar,webservices-tools.jar,mail.jar,appserv-jstl.jar,jmxremote_optional.jar,C:/Sun/AppServer/lib/SUNWjdmk/5.1/lib/jdmkrt.jar,activation.jar,appserv-rt.jar,appserv-admin.jar,appserv-cmp.jar,C:/Sun/AppServer/updatecenter/lib/updatecenter.jar,C:/Sun/AppServer/jbi/lib/jbi.jar,C:/Sun/AppServer/imq/lib/imqjmx.jar,C:/Sun/AppServer/lib/ant/lib/ant.jar,dbschema.jar
-Dcom.sun.aas.configName=server-config
-Dcom.sun.aas.configRoot=C:/Sun/AppServer/config
-Dcom.sun.aas.defaultLogFile=C:/Sun/AppServer/domains/domain1/logs/server.log
-Dcom.sun.aas.domainName=domain1
-Dcom.sun.aas.installRoot=C:/Sun/AppServer
-Dcom.sun.aas.instanceName=server
-Dcom.sun.aas.processLauncher=SE
-Dcom.sun.aas.promptForIdentity=true
-Dcom.sun.enterprise.config.config_environment_factory_class=com.sun.enterprise.config.serverbeans.AppserverConfigEnvironmentFactory
-Dcom.sun.enterprise.overrideablejavaxpackages=javax.help,javax.portlet
-Dcom.sun.enterprise.taglibs=appserv-jstl.jar,jsf-impl.jar
-Dcom.sun.enterprise.taglisteners=jsf-impl.jar
-Dcom.sun.updatecenter.home=C:/Sun/AppServer/updatecenter
-Ddomain.name=domain1
-Djava.endorsed.dirs=C:/Sun/AppServer/lib/endorsed
-Djava.ext.dirs=C:/Program Files/Java/jdk1.6.0_11/lib/ext;C:/Program Files/Java/jdk1.6.0_11/jre/lib/ext;C:/Sun/AppServer/domains/domain1/lib/ext;C:/Sun/AppServer/javadb/lib
-Djava.library.path=C:\Sun\AppServer\lib;C:\Sun\AppServer\lib;C:\Sun\AppServer\bin;C:\Sun\AppServer\bin
-Djava.security.auth.login.config=C:/Sun/AppServer/domains/domain1/config/login.conf
-Djava.security.policy=C:/Sun/AppServer/domains/domain1/config/server.policy
-Djava.util.logging.manager=com.sun.enterprise.server.logging.ServerLogManager
-Djavax.management.builder.initial=com.sun.enterprise.admin.server.core.jmx.AppServerMBeanServerBuilder
-Djavax.net.ssl.keyStore=C:/Sun/AppServer/domains/domain1/config/keystore.jks
-Djavax.net.ssl.trustStore=C:/Sun/AppServer/domains/domain1/config/cacerts.jks
-Djdbc.drivers=org.apache.derby.jdbc.ClientDriver
-Djmx.invoke.getters=true
-Dsun.rmi.dgc.client.gcInterval=3600000
-Dsun.rmi.dgc.server.gcInterval=3600000
-client
-XX:+UnlockDiagnosticVMOptions
-XX:MaxPermSize=192m
-Xmx512m
-XX:NewRatio=2
-XX:+LogVMOutput
-XX:LogFile=C:/Sun/AppServer/domains/domain1/logs/jvm.log
-cp
C:/Sun/AppServer/lib/jhall.jar;C:\Sun\AppServer\lib\appserv-launch.jar
com.sun.enterprise.server.PELaunch
start
CORE5076: Using [Java HotSpot(TM) Client VM, Version 1.6.0_11] from [Sun Microsystems Inc.]
SEC1002: Security Manager is OFF.
Using MQ RA for Broker lifecycle control
SEC1143: Loading policy provider com.sun.enterprise.security.provider.PolicyWrapper.
WEB0114: SSO is disabled in virtual server [server]
WEB0114: SSO is disabled in virtual server [__asadmin]
REgistering Custom ContextConfig
REgistering Custom Context
JTS5014: Recoverable JTS instance, serverId = [3700]
ADM1079: Initialization of AMX MBeans started
ADM1504: Here is the JMXServiceURL for the Standard JMXConnectorServer: [service:jmx:rmi:///jndi/rmi://Furutani:8686/jmxrmi]. This is where the remote administrative clients should connect using the standard JMX connectors
ADM1506: Status of Standard JMX Connector: Active = [true]
JMS Service Connection URL is :mq://Furutani:7676/
MQJMSRA_RA1101: SJSMQ JMS Resource Adapter starting…
MQJMSRA_EB1101: EMBEDDED broker started with code =0
MQJMSRA_RA1101: SJSMQ JMSRA Started:DIRECT
LDR5010: All ejb(s) of [MEjbApp] loaded successfully!
EJB5109:EJB Timer Service started successfully for datasource [jdbc/__TimerPool]
LDR5010: All ejb(s) of [__ejb_container_timer_app] loaded successfully!
endpoint.determine.destinationtype
LDR5010: All ejb(s) of [JMSProcess-ejb] loaded successfully!
JBIFW0010: JBI framework ready to accept requests.
WEB0302: Starting Sun-Java-System/Application-Server.
WEB0712: Starting Sun-Java-System/Application-Server HTTP/1.1 on 8080
WEB0712: Starting Sun-Java-System/Application-Server HTTP/1.1 on 8181
WEB0712: Starting Sun-Java-System/Application-Server HTTP/1.1 on 4848
SMGT0007: Self Management Rules service is enabled
Application server startup complete.
MQJMSRA_MF1101: setAddressList:NOT setting default value=localhost
MQJMSRA_MF1101: setPassword:NOT setting default value
MQJMSRA_MF1101: setUserName:NOT setting default value=guest
Jundi
Furutani
Roberto
O que realmente importa são as três últimas linhas, elas indicam que as mensagens foram corretamentes enviadas e processadas.
Link: Exemplo JMS - 13/11/2009
Saiba mais sobre JMS acessando o tutorial da SUN neste link.
Até mais,
Roberto
Capturando printscreen de sites
21/outubro/2009 - Java
Olá!
Nada como um bom projeto open source para facilitar a nossa vida. Hoje fiz um teste com o Flying Saucer para capturar um screenshot (printscreen) de um site.
É muito, mas muito fácil fazer isso com esse projeto.
Basicamente só é preciso das três linhas abaixo.
BufferedImage buff = null;
buff = Graphics2DRenderer.renderToImageAutoSize("htt://www.furutani.com.br", 1024);
ImageIO.write(buff, "PNG", new File("d:/site.png"));
Para testar a geração de imagens de um site você pode usar essa aplicação que fiz: http://www.furutani.com.br/Html2Image/
O parser dele é bem rigorso, o site não pode ter nenhuma tag faltando fechar senão a imagem não é gerada.
Até mais,
Roberto
