I am using the DisplayTag with pagination to display a List objects. The Transactions has a property called 'company' / getCompany() which is the Company object. The Company object contains a String called 'name' / getName().
My code looks like this:
<display:table name="${transactions}" id="transaction" pagesize="2" defaultsort="1">
<display:column property="id" title="ID" href="showTransactionDetails.html" paramId="id" />
<display:column property="company.name" title="Company Name" sortable="true" >
<display:column property="status" title="Status" sortable="true">
</display:table>
Here is the strange part.... Everything works great when the first page is displayed and there are a total of 11 pages with each page containing 2 records.
I can click on a page number and see the page advance. But for some strange reason, when I click on page (2-4) I get an exception:
org.apache.jasper.JasperException:
javax.servlet.ServletException:
javax.servlet.jsp.JspException:
Exception: [.LookupUtil] Error looking
up property "company.name" in object
type
"com.replacements.entity.Transaction".
Cause: null
(It's also important to note that all of the Transaction records contain a value for the company.name since its a required field in my DB)
Is it possible that the company is null. That is, you have a transaction with no company in the database.
I solved it by changing the company property in Hibernate mapping to "lazy=false"
I'm still not sure why the pagination worked from some pages and not all. But this fixed it.
Thank you all for your ideas.
As #Vincent says, likely company is null. You may have a value in your database, but maybe there is an issue where your Transaction class isn't properly reading the db value and setting its company member. Have you tried setting a breakpoint and looking at the Transaction instance?
My first guess is that there is an empty company list. I would suggest you print dump to output your transaction results before they get to the display part.
If that’s not the problem I’ve seen display problems caused by special characters. One of the company names might contain a control character or some other non-displayable character.
Try changing the name="${transactions}" in the display:table tag to name="transactions".
Assuming you have the transactions collection in the session or request or whatever.
The exception message literally tells that the Transaction is null. Thus, there's apparently a null item in the transaction list behind ${transactions}. Look like a fault in the loading/populating logic of the transaction list. Maybe the last item is null? Or maybe the list is request scoped and dependent from some request parameters which are missing in the subsequent request so that loading/populating the list failed?
For the interested, if Company was null as some suggests, EL would not have error'ed that way. It would have mentioned object type Company instead.
A requestURI tag...like so.... requestURI="
Make sure you have setters and getters methods for all attributes in your class and names matching attributes names.
Related
I'm working on a small project using morphia for MongoDB. I want to know what is the best way to update a document without knowing first hand what field to update. Say for example, I have a form, after having saved to database I might want to come back and change some fields but I haven't decided yet what to change.
My current solution is doing an update for all fields whether it is changed or not and of course it throws null exception. Morphia complains on null value update.
My code looks like this:
Query<Project> q = datastore.find(Project.class, "_id", projectToUpdate.getId());
UpdateOperations<Project> update
= datastore.createUpdateOperations(Project.class)
.set("name", updatedProject.getName())
.set("deadline", updatedProject.getDeadline())
.set("priority", updatedProject.getPriority())
.set("completion", updatedProject.getCompletion())
.set("description", updatedProject.getDescription())
.set("projectManager", updatedProject.getPM())
.set("collaborators", updatedProject.getAllCollaborators())
.set("teams", updatedProject.getAllTeams())
.set("userStories", updatedProject.getUserStories())
.set("log", updatedProject.getLog());
datastore.findAndModify(q, update);
Exception
Exception in thread "main" org.mongodb.morphia.query.QueryException: Value cannot be null.
at org.mongodb.morphia.query.UpdateOpsImpl.set(UpdateOpsImpl.java:220)
at controllers.QueryProjects.updateProject(QueryProjects.java:78)
at controllers.DBConnection.TestMongo(DBConnection.java:152)
at penelope.Main.main(Main.java:12)
I was thinking about using delegate/event handler to update each field individually but I'm afraid that might degrade the performance.
You should just use datastore.save(). See an example at http://mongodb.github.io/morphia/1.3/getting-started/quick-tour/
I have a field which contains forward slashes. I'm trying to execute this Query:
QueryBuildres.termQuery("id", QueryParser.escape("/my/field/val"))
and I cannot get any results. When I'm looking for 'val' only, then I get the proper results. Any ideas why is that happening? Of course without escaping it also doesn't return the results.
UPDATE
so QP.escape parses string properly, but when request goes to elasticsearch it's double escaped
[2015-07-10 01:53:00,063][WARN ][index.search.slowlog.query] [Aaa AA] [index_name][4] took[420.8micros], took_millis[0], types[page], stats[], search_type[QUERY_THEN_FETCH], total_shards[5], source[{"query":{"term":{"pageId":"\\/path\\/and\\/testestest"}}}], extra_source[],
UPDATE 2: It works when I'm using querystring, but I wouldn't like to user that and type everything by hand.
You might have to use _id instead of Id
So the reason why I didn't get any results is the default index which I had created.
I didn't specified mapping for my field, so ElasticSearch didn't treated my field.
In ElasticSearch documentation I read, that during the analysis process, elastic search splits the string into words, lower-case them and do some other stuff.
In my case my "/path/in/my/field" was splitted into four fields:
path
in
my
field
So when I was searching for "pageId:/path/in/my/field" I didn't get any results because pageId in fact didn't contained it.
To solve the issue I had to add proper mapping to pageId field, which didn't do any preprocessing (instead of four words, now I have one "/path/in/my/field")
Links to docs:
https://www.elastic.co/guide/en/elasticsearch/guide/current/analysis-intro.html
https://www.elastic.co/guide/en/elasticsearch/guide/current/mapping-intro.html
I am using DataTables with the tables being generated in a java controller class that talks to the database. Given a category id, the controller class returns an unknown number of preformatted HTML tables, one for each section in the given category queried. Ideally I would like to display each table as a DataTable on the same page, but unsure if that's possible given that I don't know how many tables I will be getting back so I can't set up their behavior before the query.
Is there a way to format the tables when/as I get them from the controller? I attempted to prepend each table with its own .ready block but that didn't seem to do the trick though I'm fairly new to jQuery and could just be missing something. I used the barest of configuration to try to get it working first
$(document).ready(function(){
$("#results").dataTable({
"bJQueryUI" : true
});
});
$(document).ready(function() {
$('.dataTable').dataTable();
} );
Turns out to work after all, but ONLY if you specify the tables as class="dataTable" which isn't well documented or explained, hopefully this un-confuses someone else!
Am I misunderstanding a basic concept of Restful web services? I have an Android app that I am trying to use a Restful PUT. Two Mysql tables Country and StateProvince with countryId a foreign key on StateProvince table.
If I try to do a PUT to StateProvince using the following
<StateProvince><stateName>Victoria</stateName><countryId>1</countryId></StateProvince>
I get the error below. Am I misunderstanding a basic concept regarding foreign keys and Rest?
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.2.0.v20110202-r8913): org.eclipse.persistence.exceptions.DatabaseExcepti on
Internal Exception: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityCons traintViolationException: Column 'country_id' cannot be null
Error Code: 1048
Call: INSERT INTO state_province (state_id, state_name, country_id) VALUES (?, ?, ?)
bind => [3 parameters bound]
Query: InsertObjectQuery(com.pezoot.models.StateProvince[ stateId=2 ])
Short Answer: country_id is null, so this looks like a database/persistence issue. You probably didn't set the Country for the StateProvince (or add the StateProvince to the Country - haven't seen your code so I don't know how you're mapping things).
Long Answer:
Why is there an database identifier coming in as part of your HTTP request?
You need to start thinking in terms of URIs and resources - your StateProvince representation should have some kind of link that relates to a country at a particular URI (e.g. <link rel="country" href="/country/1" /> and in your resource class that handles the PUT verb, you need to be able to conver that URI in to a domain object, an entity (as it seems you're using EclipseLink) which you can use some setter method or something on to establish the database relation. The REST relationship and the database relationship are fundamentally different.
It takes practice and careful thinking to handle what seems like a simple concept (HTTP verbage) against your persistence unit. Something that seems straightforward like PUT has nontrivial processing required in order to make it work as REST would expect.
It is tempting to use database identifiers in URIs because it is easy (especially if you use subresources that just happen to magically know who their parent is: e.g. country/1/stateprovince/2) but you have to step back and ask yourself, is it country/1 or is it country/usa - you also have to ask yourself, is the country and state/province really an entity? or is it just a value object? Do you really intend to PUT a State/Province in its entirety?
Thanks guys.
Once again (unsurprisingly) it appears to be a syntax error. When I used the following:
<stateProvince>
<countryId>
<countryId>1</countryId>
</countryId>
<stateName>New South Wales</stateName> </stateProvince>
Hey presto it works. I had failed to embed the countryId as shown above previously (see old code below)
<stateProvince>
<countryId>1</countryId>
<stateName>New South Wales</stateName> </stateProvince>
And thanks Doug - your response is the sort of insight I am seeking. I dont believe I have quite wrapped my head around the use of links as you describe - but I will investigate further now
I have a select control in my view and i want to "bind" or "format" the item "Please select an item" to a null value in my backing form object.
Is that possible? because i know that making some traditional formatting doesn't work properly.
Instead i saw an example of making changes in class GenericConversionService and using that class instead of the original. (unfortunately i can't find it anymore)
This is the exception when i return a null value from my formatter class:
org.springframework.core.convert.ConversionFailedException: Unable to convert value "-1" from type 'java.lang.String' to type 'com.tesisutn.restsoft.dominio.articulo.Marca'; nested exception is java.lang.NullPointerException
Thanks a lot in advance!
It looks like your form is sending a -1 to indicate that "Please select an item" is selected.
First thing you can try is to send noting. Then the binding (when the form is send to the server) will work, the according command object field will be null.
<option value="">Please select an item</option>
If this is no option for you (for example because you use dojo), then you need to implement your own property editor or conversation (Spring 3.0)