Develop Reference

java.lang.NoSuchMethodError: com.google.gson.Gson.newBuilder()Lcom/google/gson/GsonBuilder;

I'm trying to use Unirest in my program but I keep getting this error java.lang.NoSuchMethodError: com.google.gson.Gson.newBuilder()Lcom/google/gson/GsonBuilder;
I have tried using different maven versions of Gson but I still continue to get this seror
Edid added my pom.xml, I tried deleted my .m2 but I am still having this problem
<dependencies>
<!-- https://mvnrepository.com/artifact/com.konghq/unirest-java -->
<dependency>
<groupId>com.konghq</groupId>
<artifactId>unirest-java</artifactId>
<version>3.7.00</version>
<classifier>standalone</classifier>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.twitter4j</groupId>
<artifactId>twitter4j-core</artifactId>
<version>[4.0,)</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.spigotmc</groupId>
<artifactId>Spigot8</artifactId>
<version>1.8</version>
<scope>system</scope>
<systemPath>${project.basedir}/libs/spigot-1.8.8-R0.1-SNAPSHOT-latest.jar</systemPath>
</dependency>
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>mongodb-driver</artifactId>
<version>LATEST</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.8</version>
<scope>compile</scope>
</dependency>
</dependencies>```

Could be a conflict between the GSON versions in your POM file versus what is in your container (Tomcat/JBoss) etc. Inspect the JARS in WEB-INF/lib. If there are two different versions, then delete the one which is not the same as the one currently in your maven project's POM file. I had a similar issue - my project was using gson-2.6.3.jar but a conflicting gson-2.1.jar also existed in WEB-INF/lib. I deleted gson-2.1.jar and this resolved my problem

This issue is possibly due to conflicts in Gson versions.
Go to your repository if you are on windows:
C:\Users\User_name.m2\repository\com\google\code\gson
or on Mac:-
/.m2/repository/com/google/code/gson
Delete all the existing folders.
Now, add below maven dependency in your pom file:
<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.6</version>
</dependency>
Re-build your maven project and try to run.

It seems like a dependencies issue.
Please make sure your dependencies are correct. Unirest 3.7.00 uses Gson 2.8.6
https://mvnrepository.com/artifact/com.konghq/unirest-java/3.7.00
Also, if you don't use Gson separately you don't need to specify it. Just add a dependency for unirest-java as it's described in Maven repository:
<dependency>
<groupId>com.konghq</groupId>
<artifactId>unirest-java</artifactId>
<version>3.7.00</version>
</dependency>

Using confluent avro serializer in Java - NoSuchFieldError: PASSWORD

I'm using confluent avro producer in java but while running it getting below issue.I have added all the required jar .Don't have any clue what did i miss?
Exception in thread "main" java.lang.NoSuchFieldError: PASSWORD
at io.confluent.kafka.serializers.AbstractKafkaAvroSerDeConfig.baseConfigDef(AbstractKafkaAvroSerDeConfig.java:92)
at io.confluent.kafka.serializers.KafkaAvroSerializerConfig.<clinit>(KafkaAvroSerializerConfig.java:28)
at io.confluent.kafka.serializers.KafkaAvroSerializer.configure(KafkaAvroSerializer.java:48)
at org.apache.kafka.common.serialization.ExtendedSerializer$Wrapper.configure(ExtendedSerializer.java:60)
at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:341)
at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:302)
I have tried with below configurations.
Properties prop = new Properties();
prop.put("bootstrap.servers", "localhost:9092");
prop.put("schema.registry.url", "http://localhost:8081");
//prop.put("basic.auth.user.info", "");
prop.put("ssl.keystore.type",null);
prop.put("acks", "all");
prop.put("retries", "0");
prop.put("key.serializer", "io.confluent.kafka.serializers.KafkaAvroSerializer");
prop.put("value.serializer", "io.confluent.kafka.serializers.KafkaAvroSerializer");
prop.put("group.id", "test");
These are the dependency which i used it.All the jars with latest version.
<dependency>
<groupId>io.confluent</groupId>
<artifactId>kafka-schema-registry</artifactId>
<version>4.1.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.confluent/common-config -->
<dependency>
<groupId>io.confluent</groupId>
<artifactId>common-config</artifactId>
<version>3.3.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.confluent/common-utils -->
<dependency>
<groupId>io.confluent</groupId>
<artifactId>common-utils</artifactId>
<version>3.3.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.confluent/kafka-connect-avro-converter -->
<dependency>
<groupId>io.confluent</groupId>
<artifactId>kafka-connect-avro-converter</artifactId>
<version>5.2.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.confluent/kafka-schema-registry-client -->
<dependency>
<groupId>io.confluent</groupId>
<artifactId>kafka-schema-registry-client</artifactId>
<version>5.2.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.confluent.kafka/connect-utils -->
<dependency>
<groupId>io.confluent.kafka</groupId>
<artifactId>connect-utils</artifactId>
<version>0.1.18</version>
</dependency>
<dependency>
<groupId>io.confluent.kafka</groupId>
<artifactId>connect-checkstyle</artifactId>
<version>0.1.18</version>
</dependency>
<!-- https://mvnrepository.com/artifact/io.confluent/rest-utils -->
<dependency>
<groupId>io.confluent</groupId>
<artifactId>rest-utils</artifactId>
<version>4.1.0</version>
</dependency>

I've seen this error when mixing versions.
You should only need this as the common util, client, rest-utils, etc, are all transitive dependencies
<dependency>
<groupId>io.confluent</groupId>
<artifactId>kafka-avro-serializer</artifactId>
<version>5.2.1</version>
</dependency>
https://docs.confluent.io/current/app-development/index.html#native-clients-with-serializers
Remove the rest of the dependencies, or at least create a property for the version and re-use it

Which versions should be used for Spark cassandra connection using java Language?

I'm trying to connect spark and cassandra database using Java language. For connecting spark and cassandra I'm using latest version of Spark-cassandra-Connector i.e 2.4.0. Currently I can connect spark and cassandra using connector. I am getting data in RDD format but I can not read data from that data structure. If I used row reader factory as third parameter of cassandraTable() I am getting
> Wrong 3rd argument type. Found:
> 'java.lang.Class<com.journaldev.sparkdemo.JohnnyDeppDetails>',
> required:
> 'com.datastax.spark.connector.rdd.reader.RowReaderFactory<T>'
Can any one tell me which version I should use or what is problem here?
CassandraTableScanJavaRDD pricesRDD2 =
CassandraJavaUtil.javaFunctions(sc).cassandraTable(keyspace,table,JohnnyDeppDetails.class);
My pom.xml:
<!-- Import Spark -->
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.4.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.datastax.spark/spark-cassandra-connector -->
<dependency>
<groupId>com.datastax.spark</groupId>
<artifactId>spark-cassandra-connector_2.11</artifactId>
<version>2.4.0</version>
</dependency>
<dependency>
<groupId>com.datastax.spark</groupId>
<artifactId>spark-cassandra-connector-java_2.10</artifactId>
<version>1.5.0-M2</version>
</dependency>
<dependency>
<groupId>com.datastax.cassandra</groupId>
<artifactId>cassandra-driver-core</artifactId>
<version>2.1.9</version>
</dependency>
<dependency>
<groupId>com.datastax.cassandra</groupId>
<artifactId>cassandra-driver-mapping</artifactId>
<version>2.1.9</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.spark/spark-sql -->
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.12</artifactId>
<version>2.4.0</version>
</dependency>
</dependencies>

Instead of passing the class instance, you need to create a RowReaderFactory using the mapRowTo function, like this (this is from my example):
CassandraJavaRDD<UUIDData> uuids = javaFunctions(spark.sparkContext())
.cassandraTable("test", "utest", mapRowTo(UUIDData.class));
when you'll write back, you can convert class into corresponding factory via mapToRow function.

Can't find DefaultBootstrap class in OpenSAML

I'm trying to use OpenSAML to establish communication with an IdentityProvider. The thing is I'm following this example but I can't find the class named DefaultBootstrap.
I'm using Maven to add the dependency.
<dependency>
<groupId>org.opensaml</groupId>
<artifactId>opensaml</artifactId>
<version>2.6.4</version>
</dependency>
<dependency>
<groupId>org.opensaml</groupId>
<artifactId>xmltooling</artifactId>
<version>1.3.2</version>
</dependency>
<dependency>
<groupId>org.opensaml</groupId>
<artifactId>openws</artifactId>
<version>1.4.2</version>
</dependency>
This class is supposed to be in this path:
org.opensaml.DefaultBootstrap
But I can't import it since it doesn't exist (according to eclipse)
Anyone knows why?
Cheer from Chile!

Redisson NoSuchFieldError: WRITE_BIGDECIMAL_AS_PLAIN

I just imported redisson 1.0.3 via maven, set up a redis-server on localhost on default port and wanted to try the redisson redis client. My test code looks as following:
Redisson redis = Redisson.create();
Map m = redis.getMap("someMap");
But I'm getting:
java.lang.NoSuchFieldError: WRITE_BIGDECIMAL_AS_PLAIN
at org.redisson.codec.JsonJacksonCodec.createObjectMapper(JsonJacksonCodec.java:90)
at org.redisson.codec.JsonJacksonCodec.<init>(JsonJacksonCodec.java:43)
at org.redisson.Config.<init>(Config.java:44)
at org.redisson.Redisson.create(Redisson.java:85)
at ...
As suggested in Redisson: WRITE_BIGDECIMAL_AS_PLAIN I added the dependency:
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.3.3</version>
</dependency>
But no change...
I guess redisson's dependencies are somehow broken but how can I fix this?

It seems like my classpath already contained an older version of jackson, this fixed it:
<!-- Redis deps -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.3.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.3.0</version>
</dependency>
<dependency>
<groupId>org.redisson</groupId>
<artifactId>redisson</artifactId>
<version>1.0.3</version>
</dependency>