Databases
StackOverflow2013
Postsdbo
POHow to extend already defined lists and maps in Spring application context?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow to extend already defined lists and maps in Spring application context?
    primarykey
    data
    text
    <p>Imagine a staged application context with different phases. We start with an early phase to define the necessary infrastructure. The xml application contexts are loaded sequentially. </p> <p>The reason to split up these files is an extension/plugin mechanism.</p> <p><strong>Stage 01-default-configuration.xml</strong></p> <p>We prepare and declare the map with id <code>exampleMapping</code> to enhance them later with data.</p> <pre><code>&lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="[...]"&gt; &lt;util:map id="exampleMapping" /&gt; &lt;/beans&gt; </code></pre> <p><strong>Stage 02-custom-configuration.xml</strong> <em>(optional)</em></p> <p>We configure the <code>exampleMapping</code> and add an entry.</p> <pre><code>&lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="[...]"&gt; &lt;util:map id="exampleMapping"&gt; &lt;entry key="theKey" value="theValue" /&gt; &lt;/util:map&gt; &lt;/beans&gt; </code></pre> <p><strong>Stage 03-make-use-of-configuration.xml</strong> <em>(mandatory)</em></p> <p>Uses the defined map <code>exampleMapping</code>, whether it's configured customly or it's still the empty declared map.</p> <pre><code>&lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="[...]"&gt; &lt;bean id="exampleService" class="com.stackoverflow.example.ExampleService"&gt; &lt;property name="mapping" ref="exampleMapping" /&gt; &lt;/bean&gt; &lt;/beans&gt; </code></pre> <p>The problem here is, that it's not possible to add entries to the <code>exampleMapping</code> map after the first stage. Spring throws an exception that the map with id <code>exampleMapping</code> already exists. If we leave out the first stage the map is undeclared and the third stage can't resolve <code>exampleMapping</code> which also produces an exception.</p> <p>How can I solve this issue? I read <a href="http://static.springsource.org/spring/docs/3.0.x/spring-framework-reference/html/beans.html#beans-collection-elements-merging" rel="noreferrer">Collection merging</a> (spring docs) but this didn't helped. Is it possible to add values later to maps/lists before using them?</p> <p>Thank you!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. UScodevour
    1. UScodevour
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow to extend already defined lists and maps in Spring application context?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POHow to extend already defined lists and maps in Spring application context?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POHow to extend already defined lists and maps in Spring application context?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWhat do you mean by "can't be enhanced with entries after the first stage"?
      singulars
      1. POHow to extend already defined lists and maps in Spring application context?
      1. USskaffman
    2. CO@skaffman: Sorry, ftfy.
      singulars
      1. POHow to extend already defined lists and maps in Spring application context?
      1. UScodevour
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload