Develop Reference

How to fetch RTC work item change sets using plain java api?

I am trying to fetch the changes using below code but every time it returns null. I don't know what is wrong with this code.
ILinkManager fLinkManager = (ILinkManager) repo.getClientLibrary(ILinkManager.class);
IReferenceFactory fReferenceFactory = fLinkManager.referenceFactory();
IReference reference = fReferenceFactory.createReferenceToItem(workItem.getItemHandle());
ILinkQueryPage page = fLinkManager.findLinksByTarget("com.ibm.team.filesystem.workitems.change_set", reference,
monitor);
ILinkCollection linkCollection = page.getAllLinksFromHereOn();
Collection<ILink> links = linkCollection.getLinksById("com.ibm.team.filesystem.workitems.change_set");

Prohibit resolving during loading in typesafe config

I want to prohibit resolving of a.b. I want to substitute param from another config. Like this:
val d = ConfigFactory.load(ConfigFactory.parseString(
"""
|param = x
|a.b = ${param}
""".stripMargin))
val a = ConfigFactory.parseString("param = 1")
val result = a.withFallback(d).resolve()
In this case param gets value 1, but a.b remains x
I've tried to set ConfigResolveOptions.defaults().setAllowUnresolved(true) when loading config d, but that doesn't work.
How can I overcome this?

The problem is that Config.load is resolving the substitution immediately. If you take that out it resolves like you want it to:
val p = ConfigFactory.parseString(
"""
|param = x
|a.b = ${param}
""".stripMargin)
val a = ConfigFactory.parseString("param = 1")
val result = a.withFallback(p).resolve()
println(result.getString("a.b"))
This prints 1.
You don't need to use Config.load unless you want to use reference.conf, etc. If you do want to use Config.load then you should do it after you have composed all the configs together using withFallback.
For example, this also prints 1:
val p = ConfigFactory.parseString(
"""
|param = x
|a.b = ${param}
""".stripMargin)
val d = ConfigFactory.load(p)
val a = ConfigFactory.parseString("param = 1")
val result = a.withFallback(p)
val loaded = ConfigFactory.load(result)
println(loaded.getString("a.b"))
Or, say you have an application.conf with include that you want to use with ConfigFactory.load() (per your comment).
If application.conf looks like
include "foo"
and foo.conf looks like
a.b = ${param}
then this prints 1 also:
val a = ConfigFactory.parseString("param = 1")
val app = ConfigFactory.load("application", ConfigParseOptions.defaults,
ConfigResolveOptions.defaults.setAllowUnresolved(true))
val result = a.withFallback(app).resolve
println(result.getString("a.b"))
In general, if you want A to override B to override C then you should use A.withFallback(B).withFallback(C).

I struggled a bit with the same thing: trying to use "fallbacks" to override values, when it was designed for layering/merging configs
Assuming I understand your use case, I recommend instead using file includes.
In my application.conf I have the default value
a.b = "placeholder"
And at the bottom I have the following include
# Local overrides - for development use
include "local.conf"
And finally in local.conf
param = 1
a.b = ${param}
The end result is that a.b will be overridden with 1

Found a workaround for my problem:
So If I have config file application.conf which uses include to include config files which contain substitution syntax and files which contain declaration of the config values which are going to be substituted.
val a = ConfigFactory.parseString(s"""param = 1""")
val z = ConfigFactory.parseResources("application.conf") //this doesn't resolve substitutions
val result = a.withFallback(z).resolve().withFallback(ConfigFactory.load("application.conf"))

list of vaadin's special path variables #JavaScript(value = { "vaadin://...", "???://..." }

I try to add js file to output html code in vaadin7.4.13+maven project.
I know that it is possible to use vaadin://... protocol which is translated to /VAADIN/ directory.
Now I know that this isn't the only one trick it can be used there because I've seen some other protocols being used in #JavaScript annotation but I cannot recall them. Please help me with this.
vaadin://
???://
???://
...

Looking at vaadin's source code of com.vaadin.shared.ApplicationConstants I found out these:
APP_PATH = "APP";
UIDL_PATH = "UIDL";
HEARTBEAT_PATH = "HEARTBEAT";
PUSH_PATH = "PUSH";
PUBLISHED_FILE_PATH = APP_PATH + '/' + "PUBLISHED";
APP_PROTOCOL_PREFIX = "app://";
VAADIN_PROTOCOL_PREFIX = "vaadin://";
FONTICON_PROTOCOL_PREFIX = "fonticon://";
PUBLISHED_PROTOCOL_NAME = "published";
PUBLISHED_PROTOCOL_PREFIX = PUBLISHED_PROTOCOL_NAME + "://";

Find all the attached volumes for an EC2 instance

I'm using the below code to get all the available volumes under EC2. But I can't find any Ec2 api to get already attached volumes with an instance. Please let me know how to get all attached volumes using instanceId.
EC2Api ec2Api = computeServiceContext.unwrapApi(EC2Api.class);
List<String> volumeLists = new ArrayList<String>();
if (null != volumeId) {
volumeLists.add(volumeId);
}
String[] volumeIds = volumeLists.toArray(new String[0]);
LOG.info("the volume IDs got from user is ::"+ Arrays.toString(volumeIds));
Set<Volume> ec2Volumes = ec2Api.getElasticBlockStoreApi().get()
.describeVolumesInRegion(region, volumeIds);
Set<Volume> availableVolumes = Sets.newHashSet();
for (Volume volume : ec2Volumes) {
if (volume.getSnapshotId() == null
&& volume.getStatus() == Volume.Status.AVAILABLE) {
LOG.debug("available volume with no snapshots ::" + volume.getId());
availableVolumes.add(volume);
}
}

The AWS Java SDK now provides a method to get all the block device mappings for an instance. You can use that to get a list of all the attached volumes:
// First get the EC2 instance from the id
DescribeInstancesRequest describeInstancesRequest = new DescribeInstancesRequest().withInstanceIds(instanceId);
DescribeInstancesResult describeInstancesResult = ec2.describeInstances(describeInstancesRequest);
Instance instance = describeInstancesResult.getReservations().get(0).getInstances().get(0);
// Then get the mappings
List<InstanceBlockDeviceMapping> mappingList = instance.getBlockDeviceMappings();
for(InstanceBlockDeviceMapping mapping: mappingList) {
System.out.println(mapping.getEbs().getVolumeId());
}

You can filter the output of the EC2 DescribeVolumes API call. There are various attachment.* filters available, the one you want is filtering by attached instance ID. Try the following code:
Multimap<String, String> filter = ArrayListMultimap.create();
filter.put("attachment.instance-id", instanceId);
filter.put("attachment.status", "attached");
Set<Volume> volumes = ec2Api.getElasticBlockStoreApi().get()
.describeVolumesInRegionWithFilter(region, volumeIds, filter);
The filter is a Multimap with the keys and values you want to filter on. You can actually specify the same filter multiple times, for example to get all volumes attached to a number of different instances.

You can use volumeAttachmentApi.listAttachmentsOnServer() to do this.
NovaApi novaApi = context.unwrapApi(NovaApi.class);VolumeApi volumeApi = novaApi.getVolumeExtensionForZone(region).get();
VolumeAttachmentApi volumeAttachmentApi = novaApi.getVolumeAttachmentExtensionForZone(region).get();
volumeAttachmentApi.listAttachmentsOnServer(serverId)

how to get the properties of a datasource in WAS 6.1

I am migrating an app from WAS4 to WAS6.1
A piece of code is as follows:
javax.naming.Context ctx = new javax.naming.InitialContext();
javax.sql.DataSource ds = (javax.sql.DataSource)ctx.lookup(JNDI_NAME);
dsvalue_data = new Hashtable();
confvalue_data = new Hashtable();
// Parse the datasource string and get the properties
// writeInfo will return the name of the datasource and will populate the
// dsvalue_data and confvalue_data hashtables with datasource and
// connection pool properties
String tableHeader = writeInfo(ds.toString());
aResultHandler.addObject(CV_ABOUT_DESC,tableHeader);
aResultHandler.addObject(CV_ABOUT_PAGE,dsvalue_data);
.....
.....
The problem is in WAS6.1, this ds.toString() does not give the human readable properties of the datasource
It just gives the object name (like com.ibm.ws.rsadapter.jdbc.WSJdbcDataSource#a21fg7) when i tried to print.
what should I do to get and print all the properties of the datasource?

After obtaining your datasource ds, you can get database information like this:
DatabaseMetaData md = ds.getConnection().getMetaData();
There are tons of methods to be used, you can get a list from official documentation.

#Pangea
In Was4,ds.toString() gives the details of the datasource in a readable format
which is then formatted to display the properties..like
errorMap = null
logOrphan = false
connTimeout = 180
TransactionBranchesLooselyCoupled = false
resetReadOnly = false
maxConnectionPoolSize = 10
autoConnectionCleanupDisabled = false
minConnectionPoolSize = 1
secureXACredential = false
surgeThreshold = -1
informixLockModeWait = 0
dataBaseVersion = 0
validationSQL = null
oracleStmtCacheSize = 0
orphanTimeout = 1800
stuckThreshold = -1
surgeTime = 20
stuckTime = 30
diagOptions = 0
connectionValidation = false
maxStatementCacheSize = 10
stuckTimerTime = 5
idleTimeout = 1800

What is your main objective? DataSource as such doesn't expose the properties your are looking for. May be you are confused by the aResultHandler API.
I will start with saying that you need to get rid of the aResultHandler API or refactor it to make use of DataSource.
If you doesn't have that option for whatever insane reason below is another option. Not sure if this works.
Depending upon the toString() was a bad choice made and hence your in this trouble. I suggest you try to cast the DataSource returned from JNDI lookup to WAS implementation class (do ds.getClass() to see what is the actual impl class) and see if these properties are exposed in some way.