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The class indicator field is used to create the right type of domain objectĪction: Either a class indicator field or class extraction method must be set. When using inheritance, a class indicator field or class extraction method must be set. Error code: 8Ĭause: The class indicator field has not been defined, however the descriptor has been set to use inheritance. It happens in one to many mapping, many to many mapping and collection mapping when mapping is set not to use indirection and attribute type is not declared of type .Īction: Declare the attribute to be of type. Error code: 7Ĭause: should be defined as type Vector, or a type that implements Map or Collection if using Java 2. Error code: 6Ĭause: Attribute name is missing or not specified in the mapping definition.Īction: Specify the attribute name in the mapping by calling method setAttributeName(String attribute name). Otherwise, change the mapping associated with the attribute to use indirection. It is thrown on foreign reference mappings.Īction: If you do not want to use indirection on the mapping, change the attribute to not be of type ValueHolderInterface. Attribute is defined to be of type ValueHolderInterface but the mapping is not set to use indirection. Error code: 2ĪTTRIBUTE_AND_MAPPING_WITHOUT_INDIRECTION_ MISMATCHĬause: is declared as type ValueHolderInterface but the mapping is not using indirection. Otherwise, change the mapping associated with the attribute so that it does not use indirection. It is thrown on foreign reference mappings.Īction: If you want to use indirection on the mapping, change the attribute to type ValueHolderInterface.
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Mapping is set to use indirection but the related attribute is not defined as type ValueHolderInterface. Descriptor Exceptions (1 - 176) Error code: 1ĪTTRIBUTE_AND_MAPPING_WITH_INDIRECTION_ MISMATCHĬause: is not declared as type ValueHolderInterface but the mapping uses indirection. See "Runtime and Development Exceptions" for more information.Ī description shown in the actual exception thrown.Ĭause: The most probable cause for the error.Īction: Suggestions for resolving the error.
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Each error code corresponds to an exception class. Each error entry contains a description of the error, the probable cause, and the recommended action. Example Application to Monitorįor this example, we’re gonna use a small web service application that uses an H2 database built with Maven and Jersey.This section lists each TopLink error code. Next, we’re going to look at each area of Tomcat performance, any MBeans definitions that can help you monitor performance, and the means by which you can view metric values.īut first, let’s start with investigating a very simple application that we are going to use as an example to monitor. Tomcat servers help you monitor performance by providing JMX beans for most of these metrics, which can be verified using a tool like Tomcat Manager or JavaMelody.
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The uptime metric shows how long your server has been running or down. This metric helps identify codebase issues. Monitoring the data connection pool can help determine the number of connections in a pool that your application needs. Users are likely to quit if your system takes too long to respond to requests, therefore it is crucial to monitor the response time and investigate the potential causes of response delays. Number of SessionsĪ similar measure to the request throughput, this metric identifies the number of sessions the server can support at a given time. Request Throughput measures the number of requests the server can handle for a certain unit of time and helps determine your hardware needs. Too many active threads at the same time can slow down the application or the whole server. Additionally, you need to see if a sufficient amount of memory has been freed up. You have to determine the right frequency for running garbage collection, since this is a resource-intensive process.
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In addition, using as little available memory as possible could decrease your memory needs and minimize costs. This reading is critical because running low on heap memory will cause your application to perform slower. It can even lead to OutOfMemory exceptions. Here are some of the key areas you’ll want to monitor: Memory Usage When checking application performance, there are several areas that provide clues on whether everything is working within ideal parameters.