connection not getting established between hazelcast client and hazelcast server - hazelcast

Question

The client and server configs for hazelcast v3.6 are copied below. I can run the server (listening on 127.0.0.1:5706)
I get the following error on the hazelcast client side:
[warn] c.h.c.c.n.ClientConnection - Connection [/127.0.0.1:5701] lost. Reason: java.lang.NullPointerException[null]
[warn] c.h.c.s.i.ClusterListenerSupport - Unable to get alive cluster connection, try in 2986 ms later, attempt 1 of 2.
hazelcast-client.xml
<?xml version="1.0" encoding="UTF-8"?>
<hazelcast-client xsi:schemaLocation="http://www.hazelcast.com/schema/client-config hazelcast-client-config-3.6.xsd"
xmlns="http://www.hazelcast.com/schema/client-config"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<group>
<name>dev</name>
<password>dev-pass</password>
</group>
<properties>
<property name="hazelcast.client.shuffle.member.list">true</property>
<property name="hazelcast.client.heartbeat.timeout">60000</property>
<property name="hazelcast.client.heartbeat.interval">5000</property>
<property name="hazelcast.client.event.thread.count">5</property>
<property name="hazelcast.client.event.queue.capacity">1000000</property>
<property name="hazelcast.client.invocation.timeout.seconds">120</property>
</properties>
<network>
<cluster-members>
<address>127.0.0.1:5701</address>
<!-- <address>0.0.0.0</address> -->
</cluster-members>
<smart-routing>true</smart-routing>
<redo-operation>true</redo-operation>
<connection-timeout>60000</connection-timeout>
<connection-attempt-period>3000</connection-attempt-period>
<connection-attempt-limit>2</connection-attempt-limit>
<socket-options>
<tcp-no-delay>false</tcp-no-delay>
<keep-alive>true</keep-alive>
<reuse-address>true</reuse-address>
<linger-seconds>3</linger-seconds>
<timeout>-1</timeout>
<buffer-size>32</buffer-size>
</socket-options>
<socket-interceptor enabled="false">
<class-name>com.hazelcast.examples.MySocketInterceptor</class-name>
<properties>
<property name="foo">bar</property>
</properties>
</socket-interceptor>
<ssl enabled="false">
<factory-class-name>com.hazelcast.examples.MySslFactory</factory-class-name>
</ssl>
<aws enabled="false" connection-timeout-seconds="11">
<inside-aws>true</inside-aws>
<access-key>TEST_ACCESS_KEY</access-key>
<secret-key>TEST_SECRET_KEY</secret-key>
<region>us-east-1</region>
<host-header>ec2.amazonaws.com</host-header>
<security-group-name>hazelcast-sg</security-group-name>
<tag-key>type</tag-key>
<tag-value>hz-nodes</tag-value>
</aws>
</network>
<executor-pool-size>40</executor-pool-size> <!-- reduce the pool size after profiling -->
<security>
<credentials>com.hazelcast.security.UsernamePasswordCredentials</credentials>
</security>
<listeners>
<!--<listener>com.hazelcast.examples.MembershipListener</listener>
<listener>com.hazelcast.examples.InstanceListener</listener>
<listener>com.hazelcast.examples.MigrationListener</listener>
-->
</listeners>
<!-- change to kryo -->
<!-- <serialization>
<portable-version>3</portable-version>
<use-native-byte-order>true</use-native-byte-order>
<byte-order>BIG_ENDIAN</byte-order>
<enable-compression>false</enable-compression>
<enable-shared-object>true</enable-shared-object>
<allow-unsafe>false</allow-unsafe>
<data-serializable-factories>
<data-serializable-factory factory-id="1">com.hazelcast.examples.DataSerializableFactory
</data-serializable-factory>
</data-serializable-factories>
<portable-factories>
<portable-factory factory-id="2">com.hazelcast.examples.PortableFactory</portable-factory>
</portable-factories>
<serializers>
<global-serializer>com.hazelcast.examples.GlobalSerializerFactory</global-serializer>
<serializer type-class="com.hazelcast.examples.DummyType"
class-name="com.hazelcast.examples.SerializerFactory"/>
</serializers>
<check-class-def-errors>true</check-class-def-errors>
</serialization>
-->
<native-memory enabled="false" allocator-type="POOLED">
<size unit="MEGABYTES" value="128" />
<min-block-size>1</min-block-size>
<page-size>1</page-size>
<metadata-space-percentage>40.5</metadata-space-percentage>
</native-memory>
<!--
<proxy-factories>
<proxy-factory class-name="com.hazelcast.examples.ProxyXYZ1" service="sampleService1"/>
<proxy-factory class-name="com.hazelcast.examples.ProxyXYZ2" service="sampleService1"/>
<proxy-factory class-name="com.hazelcast.examples.ProxyXYZ3" service="sampleService3"/>
</proxy-factories>
-->
<load-balancer type="random"/>
<!--
Beware that near-cache eviction configuration is different for NATIVE in-memory format.
Proper eviction configuration example for NATIVE in-memory format :
`<eviction max-size-policy="USED_NATIVE_MEMORY_SIZE" eviction-policy="LFU" size="60"/>`
-->
<!-- <near-cache name="default">
<max-size>2000</max-size>
<time-to-live-seconds>90</time-to-live-seconds>
<max-idle-seconds>100</max-idle-seconds>
<eviction-policy>LFU</eviction-policy>
<invalidate-on-change>true</invalidate-on-change>
<in-memory-format>OBJECT</in-memory-format>
<local-update-policy>INVALIDATE</local-update-policy>
</near-cache>
-->
<!--
<query-caches>
<query-cache name="query-cache-name" mapName="map-name">
<predicate type="class-name">com.hazelcast.examples.ExamplePredicate</predicate>
<entry-listeners>
<entry-listener include-value="true" local="false">com.hazelcast.examples.EntryListener</entry-listener>
</entry-listeners>
<include-value>true</include-value>
<batch-size>1</batch-size>
<buffer-size>16</buffer-size>
<delay-seconds>0</delay-seconds>
<in-memory-format>BINARY</in-memory-format>
<coalesce>false</coalesce>
<populate>true</populate>
<eviction eviction-policy="LRU" max-size-policy="ENTRY_COUNT" size="10000"/>
<indexes>
<index ordered="false">name</index>
</indexes>
</query-cache>
</query-caches>
-->
</hazelcast-client>
hazelcast server
here is the console message on the server and server config file:
console message
INFO: [127.0.0.1]:5701 [dev] [3.6] Established socket connection between /127.0.1.1:5701 and /127.0.0.1:47301
Mar 10, 2016 12:01:48 PM com.hazelcast.nio.tcp.TcpIpConnection
INFO: [127.0.0.1]:5701 [dev] [3.6] Connection [/127.0.0.1:47301] lost. Reason: java.io.EOFException[Remote socket closed!]
hazelcast.xml (server)
<?xml version="1.0" encoding="UTF-8"?>
<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.6.xsd"
xmlns="http://www.hazelcast.com/schema/config"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<group>
<name>dev</name>
<password>dev-pass</password>
</group>
<network>
<port auto-increment="true" port-count="100">5701</port>
<outbound-ports>
<ports>0-5900</ports>
</outbound-ports>
<join>
<multicast enabled="false">
<!--<multicast-group>224.2.2.3</multicast-group>
<multicast-port>54327</multicast-port>-->
</multicast>
<tcp-ip enabled="true">
<member>127.0.0.1</member>
</tcp-ip>
</join>
<interfaces enabled="true">
<interface>127.0.0.1</interface>
</interfaces>
<ssl enabled="false" />
<socket-interceptor enabled="false" />
<symmetric-encryption enabled="false">
<algorithm>PBEWithMD5AndDES</algorithm>
<!-- salt value to use when generating the secret key -->
<salt>thesalt</salt>
<!-- pass phrase to use when generating the secret key -->
<password>thepass</password>
<!-- iteration count to use when generating the secret key -->
<iteration-count>19</iteration-count>
</symmetric-encryption>
</network>
<partition-group enabled="false"/>
<executor-service name="default">
<pool-size>16</pool-size>
<!--Queue capacity. 0 means Integer.MAX_VALUE.-->
<queue-capacity>0</queue-capacity>
</executor-service>
<map name="userMap">
<async-backup-count>1</async-backup-count>
<near-cache>
<max-size>5000</max-size>
<invalidate-on-change>true</invalidate-on-change>
</near-cache>
<map-store enabled="false">
<class-name></class-name>
<write-delay-seconds>0</write-delay-seconds>
</map-store>
</map>
</hazelcast>
Client code
ClientConfig clientConfig = new XmlClientConfigBuilder().build(); //the xml file is being loaded
HazelcastInstance hazelcastClient = HazelcastClient.newHazelcastClient(clientConfig);
I do not have a firewall running on my computer. Any thoughts on what I may have misconfigured?
Update:
I am able to connect when i specify the ip address programmatically so I am assuming the issue is either with my client config or how I am readig it:
ClientCOnfig clientConfig = new ClientConfig();
clientConfig.getNetworkConfig().addAddress("127.0.0.1");
HazelcastInstance hcastClient = HazelcastClient.newHazelcastClient(clientConfig);

Answer 1

The issue was caused by the following line in the client config xml file:
<security>
<credentials>com.hazelcast.security.UsernamePasswordCredentials</credentials>
</security>
Once this was commented out, the client was able to connect to the server. I will update once I gather more information regarding its usage.
Only seems to be available in enterprise edition, not the community one but ideally, it should have either let the connection establish or generate a meaningful error message.