Rule of Tech

Installing Sun JDK 1.6 on CentOS

Howto,Sysadmin,Tech — Tags: centos, howto, java, sysadmin — Marko @ 16:28

CentOS doesn’t have a package for Sun JDK so it has to installed manually. It’s fairly easy but there are some steps to do that. This guide has been tested on CentOS 5.4 x64_86.

Step 1. Initial setup for building RPM
-!- Do this with a non-root user

Create ~/.rpmmacros

$ vim ~/.rpmmacros
%_topdir /home//rpmbuild
%_tmppath %{_topdir}/tmp

Create needed folders:

$ mkdir -p ~/rpmbuild/{SOURCES,SRPMS,SPECS,RPMS,tmp,BUILD}

Build environment needs to be complete. Some needed packages are:
- ```
$ sudo yum install -y rpm-build gcc gcc-c++ redhat-rpm-config
```

Step 2. Installing your favorite JDK

Download Sun JDK 1.6 update 14 from Sun Java download or the Sun JDK archive.
- Choose the correct platform (for me it’s Linux x64) and download jdk-6u18-linux-x64-rpm.bin
Give it executable rights: $ chmod 755 jdk-6u18-linux-x64-rpm.bin
Run the binary to extract it into RPM form: $ ./jdk-6u18-linux-x64-rpm.bin

Install it:

$ sudo rpm -Uvh jdk-6u18-linux-amd64.rpm

Log out and in again to make the changes in the paths take effect

Check the install

$ java -version
java version "1.6.0_18"
Java(TM) SE Runtime Environment (build 1.6.0_18-b07)
Java HotSpot(TM) 64-Bit Server VM (build 16.0-b13, mixed mode)

Java is now installed on /usr/bin/java

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Using RichFaces 3 dataScroller and dataTable -components

Programming — Tags: java, jsf, Programming, richfaces — Marko @ 12:59

RichFaces provides some nice AJAX-components for Java Server Faces but the documentation and examples could be better. RichFaces has great documentation compared to some other frameworks but it could be better with adding a little bit of real world and down to earth examples. So here is one example of using RichFaces dataScroller and dataTable -components with custom CSS-styling, backingBean and JSF-page snippets using Richfaces 3.3.2.SR1 and JSF 1.2_12.

Using RichFaces dataScroller and dataTable components has a big negative property: they work nicely if the amount of data is small but when the row count reaches to thousands they become sluggish or stop working. The rich:dataScroller needs the complete datamodel being loaded into memory and only displays a part of it. Not very efficient if the rowcount exceeds 1000 or so.

Anyways here is some real world example. The icons used in the examples for dataScroller are from Crystal Project Icons.

JSF-page

<h:form id="myForm">
    <rich:dataScroller styleClass="dataScroller" id="scroller" 
        for="resultTable" maxPages="15" fastStep="3"
        renderIfSinglePage="false" immediate="false" 
        binding="#{backingBean.scroller}" page="#{backingBean.scrollerPage}">
        <f:facet name="first" >
            <h:graphicImage id="firstImage" styleClass="scroller" 
            url="images/crystal/tab_first.png" alt="first"/>
        </f:facet>
        <f:facet name="last">
            <h:graphicImage id="lastImage" styleClass="scroller" 
                url="images/crystal/tab_last.png" alt="last"/>
        </f:facet>
        <f:facet name="previous">
            <h:graphicImage id="prevImage" styleClass="scroller" 
                url="images/crystal/tab_left.png" alt="previous"/>
            </f:facet>
        <f:facet name="next">
            <h:graphicImage id="nextImage" styleClass="scroller" 
                url="images/crystal/tab_right.png" alt="previous"/>
        </f:facet>
        <f:facet name="fastforward">
            <h:graphicImage id="ffImage" styleClass="scroller" 
                url="images/crystal/tab_fastf.png" alt="next"/>
        </f:facet>
        <f:facet name="fastrewind">
            <h:graphicImage id="frImage" styleClass="scroller" 
                url="images/crystal/tab_fastr.png" alt="next"/>
        </f:facet>
        <f:facet name="first_disabled" >
            <h:graphicImage id="firstImage_d" styleClass="scroller" 
                url="images/crystal/tab_first.png" alt="first"/>
        </f:facet>
        <f:facet name="last_disabled">
            <h:graphicImage id="lastImage_d" styleClass="scroller" 
                url="images/crystal/tab_last.png" alt="last"/>
        </f:facet>
        <f:facet name="previous_disabled">
            <h:graphicImage id="prevImage_d" styleClass="scroller" 
                url="images/crystal/tab_left.png" alt="previous"/>
        </f:facet>
        <f:facet name="next_disabled">
            <h:graphicImage id="nextImage_d" styleClass="scroller" 
                url="images/crystal/tab_right.png" alt="next"/>
        </f:facet>
        <f:facet name="fastforward_disabled">
            <h:graphicImage id="ffImage_d" styleClass="scroller" 
                url="images/crystal/tab_fastf.png" alt="next"/>
        </f:facet>
        <f:facet name="fastrewind_disabled">
            <h:graphicImage id="frImage_d" styleClass="scroller" 
                url="images/crystal/tab_fastr.png" alt="previous"/>
        </f:facet>
        <f:facet name="controlsSeparator">
            <h:outputText id="sep" value=" " />
        </f:facet>
</rich:dataScroller>
 
<rich:dataTable styleClass="resultTable" id="resultTable" 
    rows="10" rowClasses=",odd"  columnClasses="col"  
    value="#{backingBean.resultList}" binding="#{backingBean.resultData}" 
    var="h" sortMode="multi">
    <rich:column sortBy="#{h.desc}">
        <f:facet name="header">
            <h:outputText value="description" />
        </f:facet>
        <h:commandLink value="#{h.desc}"
            action="#{backingBean.showRowData}">
            <f:param name="selectedRow" value="#{h.desc" />
        </h:commandLink>
    </rich:column>
    <rich:column sortBy="#{h.value}">
        <f:facet name="header">
            <h:outputText value="value" />
        </f:facet>
        <h:outputText value="#{h.value}" />
    </rich:column>
</rich:dataTable>
</h:form>

Backing Bean

Create some variables for dataScroller and getters and setters for them:

// RichFaces dataScroller variables
private HtmlDatascroller scroller = new HtmlDatascroller();
private String scrollerPage = "";
 
// Getting the clicked row's data
public String showRowdata() {
  MyDataModel current = (myDataModel) getResultData().getRowData();
}

CSS styling

/* =RichFaces DataScroller
----------------------------------------------- */
.rich-datascr {font-size: 1.1em;border: 0;}
.rich-table-cell {font-size: 1.0em;}
.rich-table-sortable-header {font-size: 1.1em;font-weight: bold;}
td.rich-datascr-button {background-color: #fff;border: 0px solid #ccc;text-decoration: none;}
td.rich-datascr-button-dsbld {background-color: #fff;}
.rich-datascr-ctrls-separator {padding-right: 5px;}
.rich-dtascroller-table {background: #fff;border: 0;}
.scroller {display: block;background-color: #fff;border: 1px solid #ccc;padding: 3px 3px;margin: 0px 5px 5px 5px;text-decoration: none;}
.scroller:hover {background-color: #eee;}
td.rich-datascr-button-dsbld .scroller {background-color: #eee;}
td.rich-datascr-inact {font-size: 1.2em;color: #000;border: 0;}
td.rich-datascr-inact:hover {text-decoration: underline;}
td.rich-datascr-act {font-size: 1.2em;text-decoration: underline;}
td.rich-datascr-act {border: 0;font-weight: bold;}

Selecting All rows with JavaScript

Add to the JSF-page a new column which has the checkbox. We are using JavaScript to loop through the input fields which are after :tu -ending id-field.

<rich:column>
  <f:facet name="header">
    <h:panelGroup layout="block">
      <script type="text/javascript">
        //<![CDATA[
        // RichFaces datatable select all -checkbox
        function checkAllCheckboxesInTable( inputId, state ){
          var commonIdPart = inputId.substr(0, inputId.lastIndexOf(':'));
          var tableId = commonIdPart + ':tu'
          var tableElement = document.getElementById( tableId );
          var inputs = tableElement.getElementsByTagName('input');
          for (var i = 0; i <= inputs.length; i++){
            var input = inputs[i];
            if (input != undefined) {
              if( input.getAttribute('type') == 'checkbox' && state){
                input.setAttribute('checked', state);
              } else{
                input.setAttribute('checked', false);
                input.removeAttribute('checked');
              }
            }
          }
        }
        //]]>
      </script>
      <h:selectBooleanCheckbox id="t0" onclick="checkAllCheckboxesInTable( this.id, this.checked );">
        <a4j:support event="onchange" reRender="resultTable"/>
      </h:selectBooleanCheckbox>
    </h:panelGroup>
  </f:facet>
  <h:selectBooleanCheckbox id="t1" value="#{h.selected}" />
</rich:column>

Selecting All rows in backing bean

You can also check all the checkboxes from the backingBean but it has problems with table ordering and when the lists order changes the selection goes wrong.

Add to the JSF-page a new column:

<rich:column>
  <f:facet name="header">
    <h:selectBooleanCheckbox id="t0" value="#{backingBean.selectedAll}" onclick="this.blur()">
        <a4j:support event="onchange" actionListener="#{backingBean.selectAll}" reRender="resultTable, t0, t1"/>
      </h:selectBooleanCheckbox>
    </f:facet>
  <h:selectBooleanCheckbox id="t1" value="#{h.selected}" />
</rich:column>

Make a new method to your backingBean:

public void selectAll(ActionEvent event) {
	logger.info("*** backingBean.selectAll(): " + scrollerPage + " ***");
 
	// get the current scroller page
	int page = Integer.valueOf(scrollerPage).intValue();
	if (page != 0) {
	    page = page - 1;
	}
	int start = page * 10;
	int stop = (page * 10) + 10;
	if (stop > getResultList().size()) {
	    stop = getResultList().size();
	}
	logger.debug("> page: " + page + "; start: " + start + "; stop: " + stop);
 
	// check the boxes on the active page
	for (int i = start; i < stop; i++) {
	    logger.debug("> valitaan: " + i + "; " + selectedAll);
	    getResultList().get(i).setSelected(selectedAll);
	}
}

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