Почему синие или голубые самолёты на флайтрадаре

Синий/голубой цвет значит что трекинг самолёта идёт через спутник.

https://www.flightradar24.com/

Why are some aircraft shown as blue on the map?

Aircraft displayed as blue icons are currently being tracked via satellite. Satellites are collecting the ADS-B signals from aircraft and transmitting them to the Flightradar24 network. Space-based ADS-B tracking will be used to supplement our terrestrial receiver network.

https://www.flightradar24.com/faq

Mongodb aggregate: convert date to another timezone

Mongo version 3.6 timezone operator in  dateToString

Mongo version 3.4 DateToString and Add:

project()
.and(DateOperators.DateToString.dateOf(ArithmeticOperators.Add.valueOf(DATE).add(offsetMilliseconds))
.toString("%Y-%m-%d")).as(DATE_DAYS);

"dateDays": {
"$dateToString": {
"format": "%Y-%m-%d",
"date": {
"$add": ["$date", -36000000]
}
}
}

mongodb download 3.6 and 3.4

https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2008plus-ssl-3.6.14.zip

https://fastdl.mongodb.org/win32/mongodb-win32-x86_64-2008plus-3.4.23.zip

https://www.mongodb.org/dl/win32/

Totalcommander search exact filename

Total Commander how to search exact filename:

use dot sign at the end

Сравнение лед лент (LED comparison)

 Led-lenta.com.ua

PROBLEM: Karaf restarting bundles twice at startup with logs:

BlueprintExtender Starting BlueprintContainer destruction process for bundle

LifecycleManager Closing application context OsgiBundleXmlApplicationContext

DependencyWaiterApplicationContextExecutor Shutting down normally appCtx OsgiBundleXmlApplicationContext

OsgiBundleXmlApplicationContext Unpublishing application context OSGi service for bundle

DefaultListableBeanFactory Destroying singletons in 

OsgiServiceFactoryBean Unregistered service 

SOLUTION:

Remove versions in manifest file. A specially for jackson.

Как выделить текст на сайте - отмена блокировки мышки

javascript:(function(){function ats(){var styles='*,p,div{user-select:text !important;-moz-user-select:text !important;-webkit-user-select:text !important;}';jQuery('head').append(jQuery('

Print linux memory every 30 seconds, half a minute

 while true; do cat /proc/meminfo | grep MemFree ; sleep 30;  done

CodecConfigurationException in mongo-java-driver when using $elemMatch in $all

https://stackoverflow.com/questions/53223909/codecconfigurationexception-in-mongo-java-driver-when-using-elemmatch-in-all

https://groups.google.com/forum/#!forum/mongodb-user

Who has the same error and how to fix it?

Java code:

// For simplify code I left one criteria elemMatch in all criteria.
Criteria expectedCriteria = Criteria.where("tags").all(new Criteria().elemMatch(Criteria.where("localization").is("EN")));
String json = expectedCriteria.getCriteriaObject().toJson();

Exception:

Exception in thread "main" org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class org.springframework.data.mongodb.core.query.Criteria.
    at org.bson.codecs.configuration.CodecCache.getOrThrow(CodecCache.java:46)
    at org.bson.codecs.configuration.ProvidersCodecRegistry.get(ProvidersCodecRegistry.java:63)
    at org.bson.codecs.configuration.ProvidersCodecRegistry.get(ProvidersCodecRegistry.java:37)
    at org.bson.codecs.DocumentCodec.writeValue(DocumentCodec.java:184)
    at org.bson.codecs.DocumentCodec.writeIterable(DocumentCodec.java:207)
    at org.bson.codecs.DocumentCodec.writeValue(DocumentCodec.java:180)
    at org.bson.codecs.DocumentCodec.writeMap(DocumentCodec.java:199)
    at org.bson.codecs.DocumentCodec.writeValue(DocumentCodec.java:182)
    at org.bson.codecs.DocumentCodec.writeMap(DocumentCodec.java:199)
    at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:141)
    at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:45)
    at org.bson.Document.toJson(Document.java:313)
    at org.bson.Document.toJson(Document.java:286)
    at org.bson.Document.toJson(Document.java:273)

Documentation: https://docs.mongodb.com/manual/reference/operator/query/all/#use-all-with-elemmatch

Version of mongo-java-driver in reproduce: (in all) - 3.4.3 - 3.5.0 - 3.6.4 - 3.7.1 - 3.8.2 - 3.9.0

Mongo DB script which works for code:

db.getCollection('devices').find({ 
    "tags": {
        "$all": [{
                "$elemMatch": {
                    "key": "localization",
                    "value": {
                        "$eq": "EN"
                    }
                }
            }
        ]
    }
})

mongo-java-driver

https://spring.io/projects/spring-data-mongodb

mvnrepository links

https://mvnrepository.com/open-source/http-clients
https://mvnrepository.com/open-source/logging-frameworks
https://mvnrepository.com/open-source/core-utilities

all - https://mvnrepository.com/open-source
netty - https://mvnrepository.com/search?q=netty&sort=popular

Netty NoClassDefFoundError JdkAlpnApplicationProtocolNegotiator

PROBLEM:
Caused by: java.lang.NoClassDefFoundError: Could not initialize class io.netty.handler.ssl.JdkAlpnApplicationProtocolNegotiator
 at io.netty.handler.ssl.JdkSslContext.toNegotiator(JdkSslContext.java:285)
 at io.netty.handler.ssl.JdkSslClientContext.(JdkSslClientContext.java:261)
 at io.netty.handler.ssl.SslContext.newClientContextInternal(SslContext.java:751)
 at io.netty.handler.ssl.SslContextBuilder.build(SslContextBuilder.java:418)
 at com.relayrides.pushy.apns.ApnsClientBuilder.build(ApnsClientBuilder.java:408)

c.r.p.a.ApnsClientBuilder Native SSL provider not available; will use JDK SSL provider.

OpenSSL available? false
ALPN supported?    false
Reason for unavailability:
java.lang.IllegalArgumentException: Failed to load any of the given libraries: [netty-tcnative-linux-x86_32, netty-tcnative-linux-x86_32-fedora, netty-tcnative]
        at io.netty.util.internal.NativeLibraryLoader.loadFirstAvailable(NativeLibraryLoader.java:178)
        at io.netty.handler.ssl.OpenSsl.loadTcNative(OpenSsl.java:384)
        at io.netty.handler.ssl.OpenSsl.(OpenSsl.java:84)
        at OpenSslZav.main(OpenSslZav.java:7)


JDK vs OPENSSL
new JdkSslClientContext
new OpenSslClientContext

netty-tcnative-boringssl-static-2.0.0.Final.jar

netty-tcnative-boringssl-static-2.0.0.Final.jar\META-INF\native\
libnetty-tcnative-linux-x86_64.so
libnetty-tcnative-osx-x86_64.jnilib
netty-tcnative-windows-x86_64.dll

SOLUTION:
Update Java to arch 64
ONLY WORKS IN JAVA 64 !!!

Notepad++

https://notepad-plus-plus.org/download/v7.5.9.html

Plugin for formatting xml and json:

XML Tools 
https://sourceforge.net/projects/npp-plugins/files/XML%20Tools/Xml%20Tools%202.3.2%20r908%20Unicode%20Beta4/xmltools_2.3.2_r908_unicode_beta4.zip/download
Copy XMLTools.dll to c:\MyProgramFiles\Notepad++\plugins\
Maybe you need to copy ext_libs also.

JStool
https://code.google.com/archive/p/jstoolnpp/downloads
https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/jstoolnpp/JSToolNPP.1.16.uni.zip
Copy JSMinNPP.dll to c:\MyProgramFiles\Notepad++\plugins\

YourKit on remote server

https://www.yourkit.com/docs/java/help/profiling_j2ee_remote.jsp



export PROFILER="-agentpath:/opt/yjp/bin/linux-x86-64/libyjpagent.so=disablestacktelemetry,disableexceptiontelemetry,delay=10000,listen=all"

export JAVA_OPTS="-Xmx3G -Xms3G -Xmn1G -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/opt/xxx/log/xxx-oom.hpref $GC_OPTS $PROFILER $JMX_OPTS"

Docker: Error response from daemon, Exception caught, Bad Request - FOR PROXY USERS

PROBLEM:
C:\Users\alexeyz> docker run hello-world
Unable to find image 'hello-world:latest' locally
docker: Error response from daemon: Get https://registry-1.docker.io/v2/: Bad Request.
See 'docker run --help'.
-OR-
[ERROR] Failed to execute goal com.spotify:docker-maven-plugin:0.4.10:build (myproject.all) on project com.myproject.docker: Exception caught: Get https://registry-1.docker.io/v2/: Bad Request

SOLUTION:
1. Switch off proxy in Docker
2. Find non-proxy internet.

Mongo notes

use admin
db.runCommand( {buildInfo: 1} )
db.adminCommand({setParameter: 1, internalQueryExecMaxBlockingSortBytes:67108864})

Mask credit card number in java

https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html

String result;
if (string.length() > 4) {
result = string.replaceAll("(?<=.{4})(\\w)", "*");
} else {
result = string.replaceAll("(\\w)", "*");
}

How to include class name property when serializing json

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.TypeAdapter;
import com.google.gson.stream.JsonReader;
import com.google.gson.stream.JsonWriter;

/**
 * Only for List type fields.
 * @author alexeyz
 */
public class RuntimeClassNameTypeAdapter extends TypeAdapter> {

private static final String CLASS_NAME_PROPERTY = "type";

@Override
public void write(JsonWriter out, List
if (src == null) {out.nullValue();return;}

Gson gson = new Gson();
out.beginArray();
for (Object srcBlocker : src) {
        JsonElement serializedBlocker = gson.toJsonTree(srcBlocker);
        JsonObject blocker = (JsonObject) serializedBlocker;
        blocker.addProperty(CLASS_NAME_PROPERTY, srcBlocker.getClass().getSimpleName());
        out.jsonValue(blocker.toString());
}
out.endArray();
}



Usage:
    @JsonAdapter(RuntimeClassNameTypeAdapter.class)

    protected List book;

Http java links

https://www.programcreek.com/java-api-examples/?api=io.reactivex.netty.protocol.http.client.HttpClient

https://blogs.oracle.com/java/jdk-http-client#synchronousGet

http://www.baeldung.com/java-http-request

https://stackoverflow.com/questions/46387896/how-can-i-use-http-client-apisince-java-9-in-java8-project

https://www.mkyong.com/java/how-to-send-http-request-getpost-in-java/

http://openjdk.java.net/groups/net/httpclient/intro.html

https://alvinalexander.com/java/java-apache-httpclient-restful-client-examples

https://github.com/timboudreau/netty-http-client

https://github.com/cloudbow/netty-http-client

TODO mongodb query toJson

Operator $all produces error on toJson() method.

http://api.mongodb.com/java/current/org/bson/codecs/package-summary.html

https://mvnrepository.com/artifact/org.mongodb/mongo-java-driver

http://api.mongodb.com/java/3.0/?com/mongodb/client/model/Filters.html

http://mongodb.github.io/mongo-java-driver/3.4/bson/codecs/

Criteria criteria = Criteria.where("props").all(

new Criteria().elemMatch(Criteria.where("key").is("lang").and("value").is("EN")),

new Criteria().elemMatch(Criteria.where("key").is("photo").and("value").exists(true)));

String json = criteria.getCriteriaObject().toJson();

org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class org.springframework.data.mongodb.core.query.Criteria.
at org.bson.codecs.configuration.CodecCache.getOrThrow(CodecCache.java:46)
at org.bson.codecs.configuration.ProvidersCodecRegistry.get(ProvidersCodecRegistry.java:63)
at org.bson.codecs.configuration.ProvidersCodecRegistry.get(ProvidersCodecRegistry.java:37)
at org.bson.codecs.DocumentCodec.writeValue(DocumentCodec.java:184)

Documentation: $all with $elemMatch

If the field contains an array of documents, you can use the $all with the $elemMatch operator.

The following operation queries the inventory collection for documents where the value of the qty field is an array whose elements match the $elemMatch criteria:

copy

copied

db.inventory.find( {
                     qty: { $all: [
                                    { "$elemMatch" : { size: "M", num: { $gt: 50} } },
                                    { "$elemMatch" : { num : 100, color: "green" } }
                                  ] }
                   } )

Count how much unique field values in mongo

db.getCollection('myCollection').aggregate( 

    {$group: {"_id":"$username"}},

    {$group: {"_id":1, count:{$sum:1}}

})

db.getCollection('myCollection').aggregate( [
    {$match: { "_id.appId":"23893259736", "status" : 1 } },
    {$group: {"_id":"$_id.deviceId"}},
    {$group: {"_id":1, count:{$sum:1}}}

])

Criteria criteria = SearchQueryBuilder.parse(query);
Aggregation aggregation = Aggregation.newAggregation(
Aggregation.match(criteria),
Aggregation.group("username"),
Aggregation.group("username").count().as("count")
);
try {
AggregationResults aggregationResults = mongoTemplate.aggregate(aggregation, Devices.class, GroupAndCount.class);
GroupAndCount cbg = aggregationResults.getMappedResults().iterator().next();
return cbg.count;
} catch (Exception e) {
return 0;
}

private static final class GroupAndCount {
@Id
private Integer _id;
private Integer count;
}