Error while starting EhCahce

[vaibhav srivastava]

1. What version of Ehcache you are currently using;3.3
2. Paste the configuration for the Cache/CacheManager you have an issue with;
3. Add any name and version of other library or framework you use Ehcache with (e.g. Hibernate);NA
4. Providing JDK and OS versions maybe useful as well. .18

Hi guys ,

I am getting below error 

"org.ehcache.spi.serialization.UnsupportedTypeException: No serializer found for type 'java.util.List'."

This is how i am initializing my cache .

cacheManager = CacheManagerBuilder.newCacheManagerBuilder().

                    withCache(CACHE_NAME, 

                                  CacheConfigurationBuilder.newCacheConfigurationBuilder

                                    (String.class,List.class,ResourcePoolsBuilder.heap(10))

                                      .withExpiry(Expirations.timeToLiveExpiration(Duration.of(2, TimeUnit.HOURS)))

                                      ).build();

But cache put and get are happening . Do i need to worry about above error . Please let me know

I

[Henri Tremblay]

This is a debug log that you can indeed ignore.

When caching on heap you don't need serializers. The message is only notifying that you need to  watch out because as soon as you try to cache anywhere else that isn't on heap, you will need to give a serializer for List since the List interface isn't serializable.

Henri

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[Srinu Anumaneni]

Hi,

       I am getting no serialize for List error while creating and putting cache with List as value. How can I put List into clustered cache. Please let me know. Thanks

On Tuesday, 20 June 2017 09:03:59 UTC+5:30, Henri Tremblay wrote:

This is a debug log that you can indeed ignore.

When caching on heap you don't need serializers. The message is only notifying that you need to  watch out because as soon as you try to cache anywhere else that isn't on heap, you will need to give a serializer for List since the List interface isn't serializable.

Henri

On 19 June 2017 at 19:58, vaibhav srivastava <coolvi...@gmail.com> wrote:

1. What version of Ehcache you are currently using;3.3
2. Paste the configuration for the Cache/CacheManager you have an issue with;
3. Add any name and version of other library or framework you use Ehcache with (e.g. Hibernate);NA
4. Providing JDK and OS versions maybe useful as well. .18

Hi guys ,

I am getting below error 

"org.ehcache.spi.serialization.UnsupportedTypeException: No serializer found for type 'java.util.List'."

This is how i am initializing my cache .

cacheManager = CacheManagerBuilder.newCacheManagerBuilder().

                    withCache(CACHE_NAME, 

                                  CacheConfigurationBuilder.newCacheConfigurationBuilder

                                    (String.class,List.class,ResourcePoolsBuilder.heap(10))

                                      .withExpiry(Expirations.timeToLiveExpiration(Duration.of(2, TimeUnit.HOURS)))

                                      ).build();

But cache put and get are happening . Do i need to worry about above error . Please let me know

I

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[Henri Tremblay]

Please show us the code and the error.

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[Srinu Anumaneni]

tc-config.xml

<?xml version="1.0" encoding="UTF-8" ?>

<tc-config xmlns="http://www.terracotta.org/config"

           xmlns:ohr="http://www.terracotta.org/config/offheap-resource"

           xmlns:data="http://www.terracottatech.com/config/data-roots"

           xmlns:persistence="http://www.terracottatech.com/config/platform-persistence">

  <plugins>

    <config>

      <ohr:offheap-resources>

        <ohr:resource name="default-resource" unit="MB">512</ohr:resource>

      </ohr:offheap-resources>

    </config>

  </plugins>

  <servers>

    <server host="localhost" name="clustered">

      <tsa-port>9410</tsa-port>

      <logs>terracotta/server-logs</logs>

    </server>

  </servers>

  <failover-priority>

    <availability/>

  </failover-priority>

</tc-config>

ehcache.xml

<?xml version="1.0" encoding="UTF-8"?>

<ehcache:config

  xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'

  xmlns:terracotta='http://www.ehcache.org/v3/clustered'

  xmlns:ehcache='http://www.ehcache.org/v3'

  xsi:schemaLocation="http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.1.xsd

    http://www.ehcache.org/v3/clustered http://www.ehcache.org/schema/ehcache-clustered-ext-3.1.xsd">

  <ehcache:service>

    <terracotta:cluster>

      <terracotta:connection url="terracotta://localhost:9410/clustered"/>

      <terracotta:server-side-config auto-create="true">

        <terracotta:default-resource from="default-resource"/>

      </terracotta:server-side-config>

    </terracotta:cluster>

 </ehcache:service>

  <ehcache:cache alias="basicCache">

    <ehcache:key-type>java.lang.Long</ehcache:key-type>

    <ehcache:value-type>java.util.List</ehcache:value-type>

    <ehcache:resources>

      <ehcache:heap unit="entries">10000</ehcache:heap>

      <ehcache:offheap unit="MB">100</ehcache:offheap>

      <terracotta:clustered-dedicated unit="MB">500</terracotta:clustered-dedicated>

    </ehcache:resources>

    <terracotta:clustered-store consistency="strong" />

  </ehcache:cache>

</ehcache:config>

TestCacheManager.java

package org.ehcache.sample;

import java.net.URL;

import java.util.ArrayList;

import java.util.List;

import org.ehcache.Cache;

import org.ehcache.CacheManager;

import org.ehcache.config.Configuration;

import org.ehcache.config.builders.CacheManagerBuilder;

import org.ehcache.xml.XmlConfiguration;

public class TestTerracottaCacheManager

{

   private static TestTerracottaCacheManager cacheManager = null;

   private CacheManager cm;

   private Cache<Long, List> cache;

   private static final String DEFAULT_CACHE_NAME = "basicCache";

   private String cacheName;

   public static TestTerracottaCacheManager getInstance()

   {

      if (cacheManager == null)

      {

         cacheManager = new TestTerracottaCacheManager();

      }

      return cacheManager;

   }

   private TestTerracottaCacheManager()

   {

      // 1. Create a cache manager

      final URL url =

         TestTerracottaCacheManager.class.getResource("/ehcache.xml");

      System.out.println(url);

      Configuration xmlConfig = new XmlConfiguration(url);

      cm = CacheManagerBuilder.newCacheManager(xmlConfig);

      System.out.println("created sm");

      cm.init();

      intializeCache();

   }

   private void intializeCache()

   {

      // 2. Get a cache called "cache1", declared in ehcache.xml

      cache = cm.getCache(cacheName == null ? DEFAULT_CACHE_NAME : cacheName,

            Long.class, List.class);

      if (cache == null)

      {

         throw new NullPointerException();

      }

   }

   public void put(Long key, List<TestBean> value)

   {

      cache.put(key, value);

   }

   public List<TestBean> get(Long key)

   {

      // 5. Print out the element

      List<TestBean> ele = (List<TestBean>) cache.get(key);

      return ele;

   }

   public boolean isKeyInCache(Long key)

   {

      return cache.containsKey(key);

   }

   public void closeCache()

   {

      // 7. shut down the cache manager

      cm.close();

   }

   public static void main(String[] args)

   {

      TestTerracottaCacheManager testCache = TestTerracottaCacheManager.getInstance();

      ArrayList<TestBean> all = new ArrayList<TestBean>();

      //all.add("hello");

      TestBean tb = new TestBean();

      tb.setEmpNo(1);

      tb.setName("srinu");

      all.add(tb);

      testCache.put(1L, all);

      System.out.println(testCache.get(1L).get(0).getName());

      testCache.closeCache();

   }

   public String getCacheName()

   {

      return cacheName;

   }

   public void setCacheName(String cacheName)

   {

      this.cacheName = cacheName;

   }

}

TestBean.java

package org.ehcache.sample;

import java.io.Serializable;

public class TestBean implements Serializable {

/**

* 

*/

private static final long serialVersionUID = 1L;

private int empNo;

private String name;

public int getEmpNo() {

return empNo;

}

public void setEmpNo(int empNo) {

this.empNo = empNo;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

}

I am getting below error

Exception in thread "main" org.ehcache.StateTransitionException: Cache 'basicCache' creation in EhcacheManager failed.

at org.ehcache.core.StatusTransitioner$Transition.failed(StatusTransitioner.java:235)

at org.ehcache.core.EhcacheManager.init(EhcacheManager.java:600)

at org.ehcache.sample.TestTerracottaCacheManager.<init>(TestTerracottaCacheManager.java:43)

at org.ehcache.sample.TestTerracottaCacheManager.getInstance(TestTerracottaCacheManager.java:29)

at org.ehcache.sample.TestTerracottaCacheManager.main(TestTerracottaCacheManager.java:83)

Caused by: java.lang.IllegalStateException: Cache 'basicCache' creation in EhcacheManager failed.

at org.ehcache.core.EhcacheManager.createCache(EhcacheManager.java:293)

at org.ehcache.core.EhcacheManager.init(EhcacheManager.java:579)

... 3 more

Caused by: java.lang.RuntimeException: org.ehcache.spi.serialization.UnsupportedTypeException: No serializer found for type 'java.util.List'

at org.ehcache.core.EhcacheManager.getStore(EhcacheManager.java:488)

at org.ehcache.core.EhcacheManager.createNewEhcache(EhcacheManager.java:316)

at org.ehcache.core.EhcacheManager.createCache(EhcacheManager.java:265)

... 4 more

Caused by: org.ehcache.spi.serialization.UnsupportedTypeException: No serializer found for type 'java.util.List'

at org.ehcache.impl.internal.spi.serialization.DefaultSerializationProvider.getSerializerClassFor(DefaultSerializationProvider.java:136)

at org.ehcache.impl.internal.spi.serialization.DefaultSerializationProvider.createSerializer(DefaultSerializationProvider.java:98)

at org.ehcache.impl.internal.spi.serialization.DefaultSerializationProvider.createValueSerializer(DefaultSerializationProvider.java:90)

at org.ehcache.core.EhcacheManager.getStore(EhcacheManager.java:477)

... 6 more

[Srinu Anumaneni]

It got resolved by using ArrayList.

Thanks

[Henri Tremblay]

Yes. ArrayList is serializable so no question asked. List is not. So you need to specify a serializer.

See http://www.ehcache.org/documentation/3.5/serializers-copiers.html

Specifying a PlainJavaSerializer as the value serializer should also solve the problem if I am not mistaken.

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