502 proxy error-generate and run

17 May '15, 11:44 AM
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Hello,


I have just tried to make my first web application using Webratio. I have followed each and every step from this tutorial : https://docs.google.com/document/d/1XbeMz8USxPFEcLBB3jt1rXz2UEw4_ap5ZeBHL1e0VSM/pub

At first, when I have created my database, filled all the configuration details and clicked "refresh", everything was working fine - no error detected.

I have gone further with the creation proccess and at the end, when I click"Generate and run" this error appears : 

 

java.sql.SQLNonTransientConnectionException: Insufficient data while reading from the network - expected a minimum of 6 bytes and received only 0 bytes.  The connection has been terminated.
    at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown Source)
    at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
    at org.apache.derby.jdbc.ClientDriver.connect(Unknown Source)
    at java.sql.DriverManager.getConnection(DriverManager.java:571)
    at java.sql.DriverManager.getConnection(DriverManager.java:215)
    at com.webratio.commons.db.metadata.MetaDataRetriever.runAnt(MetaDataRetriever.java:132)
    at com.webratio.commons.db.metadata.MetaDataRetriever.main(MetaDataRetriever.java:51)
Caused by: org.apache.derby.client.am.DisconnectException: Insufficient data while reading from the network - expected a minimum of 6 bytes and received only 0 bytes.  The connection has been terminated.
    at org.apache.derby.client.net.Reply.fill(Unknown Source)
    at org.apache.derby.client.net.Reply.ensureALayerDataInBuffer(Unknown Source)
    at org.apache.derby.client.net.Reply.readDssHeader(Unknown Source)
    at org.apache.derby.client.net.Reply.startSameIdChainParse(Unknown Source)
    at org.apache.derby.client.net.NetConnectionReply.readExchangeServerAttributes(Unknown Source)
    at org.apache.derby.client.net.NetConnection.readServerAttributesAndKeyExchange(Unknown Source)
    at org.apache.derby.client.net.NetConnection.flowServerAttributesAndKeyExchange(Unknown Source)
    at org.apache.derby.client.net.NetConnection.flowUSRIDPWDconnect(Unknown Source)
    at org.apache.derby.client.net.NetConnection.flowConnect(Unknown Source)
    at org.apache.derby.client.net.NetConnection.<init>(Unknown Source)
    at org.apache.derby.client.net.NetConnection40.<init>(Unknown Source)
    at org.apache.derby.client.net.ClientJDBCObjectFactoryImpl40.newNetConnection(Unknown Source)
 

I am a beginner, so I don't have many ideas in order to solve this problem.

If you could help me with some advices, I would really appreciate it. 

Thank you very much in advance!

 

 
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Forum Expert - Level 5

Hi Ana,

this problem occurs when the connection of database is not correct or the  synchronization is not successful.

The WebRatio Community Edition is designed to generate the projects on our cloud that uses MySQL as database. For more details you can consult the guide on our learn to link http://www.webratio.com/learn/learningobject/webratio-cloud-dashboard-user-guide-v-72.

You can see also the Online Training Materials for the use of WebRatio. For example for the database you can see this video http://www.webratio.com/learn/learningobject/connecting-the-database-v-72.


Best regards,

Ombretta Malinverno

 
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