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I have a validation project where I need to parse large numbers of records each of which has around 200 fields. Fields have inter-dependencies from a validation perspective, minimums, maximums and so on. Some of the rules are expected to change over time. As a consequence I think I probably need to load the rules from xml? An extension of this is that I need to be able to generate a detailed error report listing each record and all errors associated with this record. I have been hunting for validation frameworks that may support this type of functionality and am aware of the more common ones like Hibernate and maybe JValidations, however I am looking for some guidance / recommendations for a well supported flexible framework.
My approach thus far has been to create a validation class that parses the record entity testing each field with "if-then-else" type statements. This works of course, however it is inflexible and consequently messy to manage - hence my thought that some sort of rules (engine) based approach possibly coded in xml would be better. Regardless, it would be far beyond my skill level to design such a solution.
Thanks in anticipation
You can consider OVal framework for validations and you have an option of Apache Validator and hibernate validator.
Also please refer to this link for more details.
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I am doing a Java-based web application. It allows users to enter content, which is displayed to other users.
Naturally for security reasons, I have to filter user content to prevent XSS and other attacks.
I understand that filtering user content is a much-discussed topic. I found many posts at SO, but they are related to theory discussion, PHP, ideas, etc. I need a Java library to use to avoid re-writing/inventing everything. I feel there must be one out there.
Is there such a library I can use?
Thanks for any info!
If you want to sanitise user input to prevent XSS then OWASP provide the standard implementation for doing that in their AntiSamy project.
There is a better implementation of this on google code called owasp-java-html-sanitizer, this allows you to define policies programmatically and then run the suspect HTML through the policy which will strip out all nonsense.
Here is an example from their website:
PolicyFactory policy = Sanitizers.FORMATTING.and(Sanitizers.LINKS);
String safeHTML = policy.sanitize(untrustedHTML);
This creates a policy that only allows formatting and links in the suspect HTML, everything else is removed.
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Is there any programs that are simple and stand-alone that can convert UML diagrams to java code? If there isn't what is the best eclipse plug-in?
You can also try a web application like genmymodel
It enables to generate from UML to Java. If you use a github repository, you can also preserve your changes between each generation (using JMerge annotations).
You have two way to work with UML.
First approach is to model then generate code from model. The best tools are Rational and Modelio Soft.
Second approach is to live syncrhonized java and UML. The best tool is with no doubt EclipseUML Omondo.
No. Usually they produce very bad code which is unusable. From my experience it takes a lot of work to produce UML model and it does not survive first week of implementation.
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I need to supply a base URL (such as http://www.wired.com) and need to spider through the entire site outputting an array of pages (off the base URL). Is there any library that would do the trick?
Thanks.
I have used Web Harvest a couple of times, and it is quite good for web scraping.
Web-Harvest is Open Source Web Data
Extraction tool written in Java. It
offers a way to collect desired Web
pages and extract useful data from
them. In order to do that, it
leverages well established techniques
and technologies for text/xml
manipulation such as XSLT, XQuery and
Regular Expressions. Web-Harvest
mainly focuses on HTML/XML based web
sites which still make vast majority
of the Web content. On the other hand,
it could be easily supplemented by
custom Java libraries in order to
augment its extraction capabilities.
Alternatively, you can roll your own web scraper using tools such as JTidy to first convert an HTML document to XHTML, and then processing the information you need with XPath. For example, a very naïve XPath expression to extract all hyperlinks from http://www.wired.com, would be something like //a[contains(#href,'wired')]/#href. You can find some sample code for this approach in this answer to a similar question.
'Simple' is perhaps not a relevant concept here. it's a complex task. I recommend nutch.
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I am trying to see some usage samples of JPA orm.xml. If some one direct me to a link,
The schema is here,
http://java.sun.com/xml/ns/persistence/orm_2_0.xsd
There are lots of samples of each mapping type here,
http://en.wikibooks.org/wiki/Java_Persistence
Lots of examples here,
http://wiki.eclipse.org/EclipseLink/Examples/JPA
In particular,
http://wiki.eclipse.org/EclipseLink/Examples/JPA/EmployeeXML
This may not be a complete answer but, http://www.jpox.org/docs/1_2/tutorials/jpa_tutorial.html uses JPA 1.0. However, it was of use when I created my ORM.xml for JPA 2.0. I know "Enterprise JavaBeans 3.0" from O'Reilly has good examples too. Otherwise you have to look at the schema (would post the link but apparently I don't have enough rep to post multiple links) and match it up with annotations examples...at least that is what I had to do.
ORM.xml appears to be falling out of favor for the annotation version, which explains the difficulty of finding any good examples of ORM.xml file.
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I'm looking for a lightweight framework that builds on top of the Process Manager pattern:
http://www.eaipatterns.com/ProcessManager.html
I'm specifically interested in using this for doing event processing whereby I'm interested in the success or failure outcome of a particular event and passing a message on to another "stage" based on this outcome. There may be other outcomes aside from success and failure, so I want something that's a little flexible...
I'm not really looking for a heavyweight ESB to handle this sort of situation since it seems like complete overkill. Spring integration looks ok for this sort of thing. Can anybody recommend any other frameworks to help achieve this?
The alternative is to build something using the basic Spring framework...
The Apache Camel project implements the patterns from the EIP book. I think it does exactly what you need.
Camel can be used with Spring and can be deployed in several different containers, depending on your requirements.