CQ5 get service without annotation

BundleContext context = FrameworkUtil.getBundle(MyService.class).getBundleContext(); ServiceReference reference = context.getServiceReference(MyService.class.getName()); MyService myService = (MyService) context.getService(reference);

Which Programm is running on that port?

sudo lsof -i :8080

OpenSource password manager KeePass

http://keepass.info/

Trainingsweltmeister - online training planning

I've started a new project with @SchualiSan called trainingsweltmeister. The web application will be able able to calucalte a dynamically training plan, depeding on your behaviour and feeling. Currently, we only hosted the coming soon page. More update will follow!

Scheduled Service in CQ5

Cron or Quartz like behaviour in CQ5 comes out of the box. See more examples. I have seen the annotation as comments, which I think is a bad style.

import org.apache.felix.scr.annotations.Component; import org.apache.felix.scr.annotations.Property; import org.apache.felix.scr.annotations.Service; import org.slf4j.Logger; import org.slf4j.LoggerFactory; @Component @Service @Property(name="scheduler.expression", value = "0 * * * * ?") public class ScheduledJob implements Runnable { private static final Logger LOGGER = LoggerFactory.getLogger(ScheduledJob.class); public void run() { // your code goes here ... } }

Find influential online texts

I resumed activities of on old private project, that targets the issue of finding relevant information in the internet, called resonance doctrine. It uses feeds, mainly from blogs, and calculates a quality score.

Force Opera to display JSONs in browser

Maybe you suffer from the problem, that Opera always wants to download a JSON file (mime: application/json) instead of displaying it using fancy extensions like JSONviewer. This can be solved by adding a rule for mime type application/json, as seen in the screenshot. Click Settings > Preferences > Advanced > Downloads > Add.

YouTube videos to mp3 converter script

I am using a tiny shell script that converts a youtube video to mp3. It takes as input the youtube url and generates the mp3 in ~/youtube-dl. It requires youtube-dl, so probably it is limited to *NIX boxes.

$ sudo apt-get install youtube-dl

Create a file youtube-conv.sh with the following code

#/bin/sh name=$(youtube-dl --get-title ${1}|sed 's/ /_/g') echo title ${name} id=$(echo ${1} | sed 's/=/ /g' | awk '{print $2}') echo download to ${id} youtube-dl ${1} -o ${id} # > /dev/null echo convert to ~/youtube-dl/${name}.mp3 convert=$(ffmpeg -i ${id} -f mp3 ~/youtube-dl/${name}.mp3) echo ${name}.mp3 created echo remove ${id} rm ${id}

Invoke the script with the youtube url as argument, e.g.

./youtube-conv.sh http://www.youtube.com/watch?v=7cF2ZSNrEIw

Note: there are issues, if the video name contains non ASCII characters

CQ5 replace Tab in ContentFinder with custom implementation

Adobe already explained how to add a custom tab to Content Finder. In order to replace an existing tab with your custom js file, e.g. movie tab, you simply have to use the same "id" value. For the movie tab, it is cfTab-Movies

{ "tabTip": CQ.I18n.getMessage("Movies"), "id": "cfTab-Movies", "xtype": "contentfindertab", "iconCls": "cq-cft-tab-icon movies", (..) }

Parent-aware unidirectional @OneToMany relationship in Hibernate/JPA

In a classical unidirectional one-to-many relation, the referred entity (Call) is not aware of its parent (Bill).

public class Bill { (...) @OneToMany( fetch = FetchType.LAZY, cascade = CascadeType.ALL) @JoinColumn(name = "billId") private Set calls; (...) }

Though, there may be some cases, where it is reasonable to make the information of the relation also available in the child entity (again, Call), e.g. if you want to retrieve all Calls of a specific Bill. An easy way to achieve that, is to explicetily add a @JoinColumn to the child entity. This column is completely managed by JPA/Hibernate, hence not modifieable.

public class Call { (...) @Column( insertable = false, updatable = false ) private Long billId; (...) }

This solution expects, that Id column of Bill is of type long. Use orphanRemoval=true, to force removal of not associated childs.

Video lectures about machine learning

Some really good videos of an indian university, in the field of machine learning

• Decision Trees
• Neural Networks
• Back Propagation Learning

mutlitail - scrolback and pause features

The two probably most important features in multitail (via pantz.org).

Pause

To pause all the logs press the "p" key.

Scroll back

To use the log windows scroll back feature press the "b" key and select the log you want to scroll back through.

Maybe you will need those commandline options

-mb x Set scrollback buffer size (in bytes, use xKB/MB/GB). -M nlines Set the buffersize on ALL following files.

glogg - GUI-based log highlighting

Days ago, I mentioned a console based highlight tool multitail, today I want to suggest the GUI-based tool glogg. Glogg could be an *NIX alternative to the Windows flagship BareTail.

$ sudo apt-get install glogg

Apache2 file permissions

Directories

find /var/www -type d -exec chmod 0775 {} +

Files

find /var/www -type f -exec chmod 0664 {} +

Terminator - multiple terminals in one window

Terminator is a handsome python implementation of a terminal emulator, that supports tiling, which is awesome. This means, several terminals are arranged in one window

Multitail: Log output highlighting in terminal

Multitail is a command line tool primarily used to merge several log files. It is also capable of highlighting the output from one or more log files. In Ubuntu, you simply create or extend your multitail configuration in your home.

vi ~/.multitailrc

and define there your custom color scheme named yourcolorscheme

colorscheme:yourcolorscheme cs_re:red,,bold:.*ERROR.* cs_re:green:INFO

When invoking multitail command, provide the designated color scheme (-cS) you want to use.

multitail -cS yourcolorscheme -f logs/server.log

Thanks to Gilles for the input.

Howto disable upload of CQ5 SmartImage

According to the SmartImage API docs, there is a option to disable the upload of this component.

allowUpload="false"

Unfortunately, it is still possible. I tried to solve it, by preventing the click event. Nothing. I solved it using a CSS workaround, that hides the file upload field. Don't forget to specify the id in both snippets.

<image jcr:primaryType="cq:Widget" allowUpload="false" ddGroups="[media]" height="300" mimeTypes="*.jpg;*.jpeg;*.gif;*.png" mimeTypesDescription="Images" name="./image" hideLabel="true" id="some-unique-id" xtype="smartimage"> // ... </image>

Add this to your css to hide the upload field

/* Hide upload field */ #some-unique-id .x-form-item { display: none!important; }

MySQL Change root Password

Some website, I've seen, recommend

$ mysqladmin -u root -p'oldpassword' password newpass

This is bad, cause all your commands go in plain text straight into your history. Actually you should use

$ mysqladmin -u root -p password

You will be prompted for the old and a new password.

Resize an image resource in CQ5 using Java

I already posted the question on stackoverflow, but since I am not allowed yet to post a solution, I'll post it here. I found a quite low level approach, to resizes a image identified by jcrPathToImage to int targetWidth and int targetHeight.

Resize Image

Resource resource = getResourceResolver().getResource(jcrPathToImage); Asset asset = resource.adaptTo(Asset.class); Layer layer = new Layer(asset.getOriginal().getStream()) layer.resize(targetWidth, targetHeight);

Create new rendition in JCR

Extract mime type of the original image

Image image = new Image(resource); String mimeType = image.getMimeType();

Store the resized Image using its asset representation.

ByteArrayOutputStream bout = null; ByteArrayInputStream bin = null; try { bout = new ByteArrayOutputStream(2048); layer.write(mimeType, 1, bout); bin = new ByteArrayInputStream(bout.toByteArray()); asset.addRendition(resizedImgName, bin, mimeType); } finally { // close streams ... }

This may be useful to generate thumbnails.

CQ5 Dialog Validation

By registering a listener to the beforesubmit event, you can validate a dialog.

... xtype="dialog"> <listeners jcr:primaryType="nt:unstructured" beforesubmit="function(dialog){ // your validation code return isValid; }" /> <items jcr:primaryType="cq:TabPanel"> ...

Serverside Validation

After defining a custom validating servlet, you can put the following code snippet in the beforesubmit area. It is important to call the servlet using async=false, to ensure everything is handled by the same thread.

CQ.Ext.Ajax.request({ method: 'POST', url: '/content.myvalidationservlet.json', async: false, success: function(response){ // do something }, params: { ... } });