Download e-book for kindle: Pro Jakarta Velocity: From Professional to Expert by Rob Harrop


By Rob Harrop

ISBN-10: 1430207507

ISBN-13: 9781430207504

ISBN-10: 159059410X

ISBN-13: 9781590594100

Nearly any program you construct calls for a few type of output. And the output structure might switch usually, which may end up in a heavy upkeep burden and a restrictive try out cycle. yet through the use of the ability of the rate template engine, you could combine templated output into your software, decoupling the applying good judgment from the output structure.

Pro Jakarta speed: From expert to Expert leads leads you instantly towards configuration and setup, all through to full-blown software improvement. this isn't in simple terms a ebook approximately net improvement, because the multipurpose pace does greater than change JSP. as a substitute, this publication demonstrates many various pace makes use of. This in-depth ebook additionally indicates you the way to combine pace improvement and use it with different open-source frameworks and instruments, akin to Spring and Apache Struts.

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Uberspect Velocity heavily uses introspection, mainly to provide a simpIe, JavaBeans-based syntax for accessing properties on your Java objects. The actual introspection is pluggable, so you can replace the default implementation with one of your own. 4. You should use this only in special cases. Uberspectlmp1. Configuring Velocity Logging As you start to build more complex applications using Velocity, you're bound to come across the need to debug your templates. Often you'll find that the output isn't as you expected or that output isn't generated at all and you get an exception.

You do this just like any other resource loader; however, you have to specify many more parameters. resource. loader. modificationChecklnterval = 60 Table 2-6 gives a full description of each parameter. 32 Getting Started with Velocity Table 2-6. class Description As with all the previous resource loaders, you should set this to the name of the resource loader class (in this case, DataSourceResourceLoader). datasource This is the full JNDI name of the data source. You must configure the data source separately within your application server.

Getting Started with Velocity Testing ClasspathResourceLoader All that's left is to configure Velocity to find the third template. As you may have noticed, I got you to place this template in the root of the classpath. The reason for this is so that I can highlight the use of the ClasspathResourceLoader. This resource loader is the easiest to configure and is perhaps the most useful in a Web-based environment, as you have no issues with paths; all the resources are simply included in the classpath.

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Pro Jakarta Velocity: From Professional to Expert by Rob Harrop

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