Hi Massimiliano,

A 500 error generally means that either the frontend *cannot find* the 
backend, or something has gone wrong on the backend that has caused it to 
return an invalid response to the frontend.

The only way to determine the cause is by following our troubleshooting 
guide, which you should follow for any error you 
see: 
https://wiki.lyrasis.org/display/DSPACE/Troubleshoot+an+error#Troubleshootanerror-DSpace7.x(orabove)

We also have many "Common Installation Issues" documented in our Install 
Guide (at the bottom).  There are even suggestions there for this common 
500 
error: 
https://wiki.lyrasis.org/display/DSDOC7x/Installing+DSpace#InstallingDSpace-%22500ServiceUnavailable%22fromtheUserInterface

I'd recommend using those guides to debug your issue.  It's likely a 
configuration problem between the frontend & backend, as it sounds like 
they are not able to communicate properly.

Tim

On Thursday, October 5, 2023 at 7:57:51 AM UTC-5 Massimiliano CILURZO wrote:

> Dear Tim,
>     I have changed the firewalld  so http://mydspaceIP at port 80 and 
> 8080 is accessible in the lan from another PC.
> the solr server is working even if http://localhost:8983/solr/sarch give 
> me error 404.
> I have intalled the frontend 7.6 but I have on http://localhost:4000 I 
> have not inserted port 4000 on firewalld so I can't access from another IP 
> as I would like to use nginx.
> But when I installed nginx now I have the error 502 Bad Gateway on 
> http://mydspaceip at port 80.
> I presume that the error 500 is a backend error but in the dspace.log or 
> catalina,out I can't see errors.
> Could you help me to find what's wrong?
> Thanks
> Best regards
> Massimiliano
> Il giorno giovedì 5 ottobre 2023 alle 08:43:07 UTC+2 Massimiliano CILURZO 
> ha scritto:
>
>> Dear Tim, 
>>     I have copied again the  cp -R [dspace]/solr/* 
>> [solr]/server/solr/configsets and restarted solr and tomcat and now I can 
>> see the backend working.
>> on http://localhost:8080/server.
>> But if I try http://localhost:8983/solr/search the result is error 
>> status 404.
>> I have another problem if I try to connect to 
>> http://"mydspaceserver(IP):8080 I can't access from an external PC what I 
>> can do?
>> Thanks
>> Best regards
>> Massimiliano
>>
>> Il giorno giovedì 5 ottobre 2023 alle 08:34:41 UTC+2 Massimiliano CILURZO 
>> ha scritto:
>>
>>>
>>> Dear Tim,
>>>      the solr server is active and respond on http://localhost:8983 but 
>>> if I try http://localhost:8983/solr/search the system gives me error 
>>> status  404.
>>> tomcat respond on http://localhost:8080 but if I try 
>>> http://localhost:8080/server it fails and give me the previous error.
>>> Thanks
>>> Best regards
>>> Massimiliano
>>> Il giorno mercoledì 4 ottobre 2023 alle 17:15:47 UTC+2 DSpace Technical 
>>> Support ha scritto:
>>>
>>>> Hi Massimiliano,
>>>>
>>>> The error appears to be saying that your Solr is either not running or 
>>>> not responding.  See this part of the error message you shared:
>>>>
>>>>
>>>>  Error from server at http://localhost:8983/solr/search: Expected mime 
>>>> type application/octet-stream but got text/html. <p>
>>>>   Searching for Solr?<br/>
>>>>   You must type the correct path.<br/>
>>>>   Solr will respond.
>>>>
>>>> I'd recommend making sure that Solr is running on that localhost port.  
>>>> If it's in a different location, then you need to modify the "solr.server" 
>>>> configuration in either your dspace.cfg or local.cfg.  By default 
>>>> "solr.server = http://localhost:8983/solr";.
>>>>
>>>> Tim
>>>>
>>>> On Wednesday, September 27, 2023 at 5:55:37 AM UTC-5 Massimiliano 
>>>> CILURZO wrote:
>>>>
>>>>> Dear Sir/Madame,
>>>>>    I have installed the DSpace 7.6 backend
>>>>> This is the result of mvn -.v 
>>>>> Apache Maven 3.9.4 (dfbb324ad4a7c8fb0bf182e6d91b0ae20e3d2dd9)
>>>>> Maven home: /opt/maven
>>>>> Java version: 11.0.20, vendor: Red Hat, Inc., runtime: 
>>>>> /usr/lib/jvm/java-11-openjdk-11.0.20.0.8-1.el7_9.x86_64
>>>>> Default locale: it_IT, platform encoding: UTF-8
>>>>> OS name: "linux", version: "3.10.0-1160.99.1.el7.x86_64", arch: 
>>>>> "amd64", family: "unix"
>>>>> on CentOS 7
>>>>>
>>>>> I have copied the webapps in my tomcat webapps directory
>>>>> and copied the configsets of solr  with
>>>>> cp -R [dspace]/solr/* [solr]/server/solr/configsets
>>>>> If I try the browser and try to access http://localhost:8080/serve 
>>>>> <http://localhost:8080/server>r
>>>>> It shows HTTP STATUS 404 - Not found
>>>>> While the tomcat default page at http://localhost:8080  work properly.
>>>>> In the catalina log I fond this error
>>>>> 27-Sep-2023 14:04:33.002 GRAVE [main] 
>>>>> org.apache.catalina.startup.HostConfig.deployDirectory Error deploying 
>>>>> web 
>>>>> application directory [/opt/tomcat/webapps/server]
>>>>>         java.lang.IllegalStateException: Error starting child
>>>>>                 at 
>>>>> org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:686)
>>>>>                 at 
>>>>> org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:658)
>>>>>                 at 
>>>>> org.apache.catalina.core.StandardHost.addChild(StandardHost.java:662)
>>>>>                 at 
>>>>> org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1184)
>>>>>                 at 
>>>>> org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1932)
>>>>>                 at 
>>>>> java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
>>>>>                 at 
>>>>> java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
>>>>>                 at 
>>>>> org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
>>>>>                 at 
>>>>> java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:118)
>>>>>                 at 
>>>>> org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1094)
>>>>>                 at 
>>>>> org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:476)
>>>>>                 at 
>>>>> org.apache.catalina.startup.HostConfig.start(HostConfig.java:1617)
>>>>>                 at 
>>>>> org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:318)
>>>>>                 at 
>>>>> org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:114)
>>>>>                 at 
>>>>> org.apache.catalina.util.LifecycleBase.setStateInternal(LifecycleBase.java:402)
>>>>>                 at 
>>>>> org.apache.catalina.util.LifecycleBase.setState(LifecycleBase.java:345)
>>>>>                 at 
>>>>> org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:893)
>>>>>                 at 
>>>>> org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:795)
>>>>>                 at 
>>>>> org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
>>>>>                 at 
>>>>> org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1332)
>>>>>                 at 
>>>>> org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1322)
>>>>>                 at 
>>>>> java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
>>>>>                 at 
>>>>> org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
>>>>>                 at 
>>>>> java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:140)
>>>>>                 at 
>>>>> org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:866)
>>>>>                 at 
>>>>> org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:249)
>>>>>                 at 
>>>>> org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
>>>>>                 at 
>>>>> org.apache.catalina.core.StandardService.startInternal(StandardService.java:433)
>>>>>                 at 
>>>>> org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
>>>>>                 at 
>>>>> org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:922)
>>>>>                 at 
>>>>> org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
>>>>>                 at 
>>>>> org.apache.catalina.startup.Catalina.start(Catalina.java:772)
>>>>>                 at 
>>>>> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
>>>>> Method)
>>>>>                 at 
>>>>> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>>>>>                 at 
>>>>> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>>>>>                 at 
>>>>> java.base/java.lang.reflect.Method.invoke(Method.java:566)
>>>>>                 at 
>>>>> org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:347)
>>>>>                 at 
>>>>> org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:478)
>>>>>         Caused by: org.apache.catalina.LifecycleException: Failed to 
>>>>> start component 
>>>>> [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/server]]
>>>>>                 at 
>>>>> org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:419)
>>>>>                 at 
>>>>> org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:186)
>>>>>                 at 
>>>>> org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:683)
>>>>>                 ... 37 more
>>>>>         Caused by: 
>>>>> org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
>>>>> creating bean with name 'authenticationRestController': Unsatisfied 
>>>>> dependency expressed through field 'converter'; nested exception is 
>>>>> org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
>>>>> creating bean with name 'converterService': Unsatisfied dependency 
>>>>> expressed through field 'webSecurityExpressionEvaluator'; nested 
>>>>> exception 
>>>>> is org.springframework.beans.factory.UnsatisfiedDependencyException: 
>>>>> Error 
>>>>> creating bean with name 'webSecurityExpressionEvaluator' defined in file 
>>>>> [/opt/tomcat/webapps/server/WEB-INF/classes/org/dspace/app/rest/security/WebSecurityExpressionEvaluator.class]:
>>>>>  
>>>>> Unsatisfied dependency expressed through constructor parameter 0; nested 
>>>>> exception is org.springframework.beans.factory.BeanCreationException: 
>>>>> Error 
>>>>> creating bean with name 'springSecurityFilterChain' defined in class path 
>>>>> resource 
>>>>> [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class]:
>>>>>  
>>>>> Bean instantiation via factory method failed; nested exception is 
>>>>> org.springframework.beans.BeanInstantiationException: Failed to 
>>>>> instantiate 
>>>>> [javax.servlet.Filter]: Factory method 'springSecurityFilterChain' threw 
>>>>> exception; nested exception is 
>>>>> org.springframework.beans.factory.BeanCreationException: Error creating 
>>>>> bean with name 'mvcHandlerMappingIntrospector' defined in class path 
>>>>> resource 
>>>>> [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]:
>>>>>  
>>>>> Invocation of init method failed; nested exception is 
>>>>> org.springframework.beans.factory.BeanCreationException: Error creating 
>>>>> bean with name 'healthEndpointWebMvcHandlerMapping' defined in class path 
>>>>> resource 
>>>>> [org/springframework/boot/actuate/autoconfigure/health/HealthEndpointWebExtensionConfiguration$MvcAdditionalHealthEndpointPathsConfiguration.class]:
>>>>>  
>>>>> Bean instantiation via factory method failed; nested exception is 
>>>>> org.springframework.beans.BeanInstantiationException: Failed to 
>>>>> instantiate 
>>>>> [org.springframework.boot.actuate.endpoint.web.servlet.AdditionalHealthEndpointPathsWebMvcHandlerMapping]:
>>>>>  
>>>>> Factory method 'healthEndpointWebMvcHandlerMapping' threw exception; 
>>>>> nested 
>>>>> exception is 
>>>>> org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
>>>>> creating bean with name 'healthEndpoint' defined in class path resource 
>>>>> [org/springframework/boot/actuate/autoconfigure/health/HealthEndpointConfiguration.class]:
>>>>>  
>>>>> Unsatisfied dependency expressed through method 'healthEndpoint' 
>>>>> parameter 
>>>>> 0; nested exception is 
>>>>> org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
>>>>> creating bean with name 'healthContributorRegistry' defined in class path 
>>>>> resource 
>>>>> [org/springframework/boot/actuate/autoconfigure/health/HealthEndpointConfiguration.class]:
>>>>>  
>>>>> Unsatisfied dependency expressed through method 
>>>>> 'healthContributorRegistry' 
>>>>> parameter 2; nested exception is 
>>>>> org.springframework.beans.factory.BeanCreationException: Error creating 
>>>>> bean with name 'solrSearchCoreHealthIndicator' defined in class path 
>>>>> resource [org/dspace/app/rest/configuration/ActuatorConfiguration.class]: 
>>>>> Bean instantiation via factory method failed; nested exception is 
>>>>> org.springframework.beans.BeanInstantiationException: Failed to 
>>>>> instantiate 
>>>>> [org.springframework.boot.actuate.solr.SolrHealthIndicator]: Factory 
>>>>> method 
>>>>> 'solrSearchCoreHealthIndicator' threw exception; nested exception is 
>>>>> org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: 
>>>>> Error 
>>>>> from server at http://localhost:8983/solr/search: Expected mime type 
>>>>> application/octet-stream but got text/html. <p>
>>>>>   Searching for Solr?<br/>
>>>>>   You must type the correct path.<br/>
>>>>>   Solr will respond.
>>>>> </p>
>>>>>
>>>>> Related cause: 
>>>>> org.springframework.beans.factory.BeanCreationException: Error creating 
>>>>> bean with name 'jsonSchemaConverter' defined in class path resource 
>>>>> [org/springframework/data/rest/webmvc/config/RepositoryRestMvcConfiguration.class]:
>>>>>  
>>>>> Bean instantiation via factory method failed; nested exception is 
>>>>> org.springframework.beans.BeanInstantiationException: Failed to 
>>>>> instantiate 
>>>>> [org.springframework.data.rest.webmvc.json.PersistentEntityToJsonSchemaConverter]:
>>>>>  
>>>>> Factory method 'jsonSchemaConverter' threw exception; nested exception is 
>>>>> org.springframework.beans.factory.BeanCurrentlyInCreationException: Error 
>>>>> creating bean with name 'linkCollector': Requested bean is currently in 
>>>>> creation: Is there an unresolvable circular reference?
>>>>>                 at 
>>>>> org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660)
>>>>>                 at 
>>>>> org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640)
>>>>>                 at 
>>>>> org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
>>>>>                 at 
>>>>> org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:955)
>>>>>                 at 
>>>>> org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:920)
>>>>>                 at 
>>>>> org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583)
>>>>>                 at 
>>>>> org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:147)
>>>>>                 at 
>>>>> org.springframework.boot.SpringApplication.refresh(SpringApplication.java:731)
>>>>>                 at 
>>>>> org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:408)
>>>>>                 at 
>>>>> org.springframework.boot.SpringApplication.run(SpringApplication.java:307)
>>>>>                 at 
>>>>> org.springframework.boot.web.servlet.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:175)
>>>>>                 at 
>>>>> org.springframework.boot.web.servlet.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:155)
>>>>>                 at 
>>>>> org.springframework.boot.web.servlet.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:97)
>>>>>                 at 
>>>>> org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:174)
>>>>>                 at 
>>>>> org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4904)
>>>>>                 at 
>>>>> org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
>>>>>                 ... 38 more
>>>>>         Caused by: 
>>>>> org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
>>>>> creating bean with name 'converterService': Unsatisfied dependency 
>>>>> expressed through field 'webSecurityExpressionEvaluator'; nested 
>>>>> exception 
>>>>> is org.springframework.beans.factory.UnsatisfiedDependencyException: 
>>>>> Error 
>>>>> creating bean with name 'webSecurityExpressionEvaluator' defined in file 
>>>>> [/opt/tomcat/webapps/server/WEB-INF/classes/org/dspace/app/rest/security/WebSecurityExpressionEvaluator.class]:
>>>>>  
>>>>> Unsatisfied dependency expressed through constructor parameter 0; nested 
>>>>> exception is org.springframework.beans.factory.BeanCreationException: 
>>>>> Error 
>>>>> creating bean with name 'springSecurityFilterChain' defined in class path 
>>>>> resource 
>>>>> [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class]:
>>>>>  
>>>>> Bean instantiation via factory method failed; nested exception is 
>>>>> org.springframework.beans.BeanInstantiationException: Failed to 
>>>>> instantiate 
>>>>> [javax.servlet.Filter]: Factory method 'springSecurityFilterChain' threw 
>>>>> exception; nested exception is 
>>>>> org.springframework.beans.factory.BeanCreationException: Error creating 
>>>>> bean with name 'mvcHandlerMappingIntrospector' defined in class path 
>>>>> resource 
>>>>> [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]:
>>>>>  
>>>>> Invocation of init method failed; nested exception is 
>>>>> org.springframework.beans.factory.BeanCreationException: Error creating 
>>>>> bean with name 'healthEndpointWebMvcHandlerMapping' defined in class path 
>>>>> resource 
>>>>> [org/springframework/boot/actuate/autoconfigure/health/HealthEndpointWebExtensionConfiguration$MvcAdditionalHealthEndpointPathsConfiguration.class]:
>>>>>  
>>>>> Bean instantiation via factory method failed; nested exception is 
>>>>> org.springframework.beans.BeanInstantiationException: Failed to 
>>>>> instantiate 
>>>>> [org.springframework.boot.actuate.endpoint.web.servlet.AdditionalHealthEndpointPathsWebMvcHandlerMapping]:
>>>>>  
>>>>> Factory method 'healthEndpointWebMvcHandlerMapping' threw exception; 
>>>>> nested 
>>>>> exception is 
>>>>> org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
>>>>> creating bean with name 'healthEndpoint' defined in class path resource 
>>>>> [org/springframework/boot/actuate/autoconfigure/health/HealthEndpointConfiguration.class]:
>>>>>  
>>>>> Unsatisfied dependency expressed through method 'healthEndpoint' 
>>>>> parameter 
>>>>> 0; nested exception is 
>>>>> org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
>>>>> creating bean with name 'healthContributorRegistry' defined in class path 
>>>>> resource 
>>>>> [org/springframework/boot/actuate/autoconfigure/health/HealthEndpointConfiguration.class]:
>>>>>  
>>>>> Unsatisfied dependency expressed through method 
>>>>> 'healthContributorRegistry' 
>>>>> parameter 2; nested exception is 
>>>>> org.springframework.beans.factory.BeanCreationException: Error creating 
>>>>> bean with name 'solrSearchCoreHealthIndicator' defined in class path 
>>>>> resource [org/dspace/app/rest/configuration/ActuatorConfiguration.class]: 
>>>>> Bean instantiation via factory method failed; nested exception is 
>>>>> org.springframework.beans.BeanInstantiationException: Failed to 
>>>>> instantiate 
>>>>> [org.springframework.boot.actuate.solr.SolrHealthIndicator]: Factory 
>>>>> method 
>>>>> 'solrSearchCoreHealthIndicator' threw exception; nested exception is 
>>>>> org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: 
>>>>> Error 
>>>>> from server at http://localhost:8983/solr/search: Expected mime type 
>>>>> application/octet-stream but got text/html. <p>
>>>>>   Searching for Solr?<br/>
>>>>>   You must type the correct path.<br/>
>>>>>   Solr will respond.
>>>>> </p>
>>>>>
>>>>>                 at 
>>>>> org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660)
>>>>>                 at 
>>>>> org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640)
>>>>>                 at 
>>>>> org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
>>>>>                 at 
>>>>> org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1431)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:619)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208)
>>>>>                 at 
>>>>> org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1391)
>>>>>                 at 
>>>>> org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1311)
>>>>>                 at 
>>>>> org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657)
>>>>>                 ... 61 more
>>>>>         Caused by: 
>>>>> org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
>>>>> creating bean with name 'webSecurityExpressionEvaluator' defined in file 
>>>>> [/opt/tomcat/webapps/server/WEB-INF/classes/org/dspace/app/rest/security/WebSecurityExpressionEvaluator.class]:
>>>>>  
>>>>> Unsatisfied dependency expressed through constructor parameter 0; nested 
>>>>> exception is org.springframework.beans.factory.BeanCreationException: 
>>>>> Error 
>>>>> creating bean with name 'springSecurityFilterChain' defined in class path 
>>>>> resource 
>>>>> [org/springframework/security/config/annotation/web/configuration/WebSecurityConfiguration.class]:
>>>>>  
>>>>> Bean instantiation via factory method failed; nested exception is 
>>>>> org.springframework.beans.BeanInstantiationException: Failed to 
>>>>> instantiate 
>>>>> [javax.servlet.Filter]: Factory method 'springSecurityFilterChain' threw 
>>>>> exception; nested exception is 
>>>>> org.springframework.beans.factory.BeanCreationException: Error creating 
>>>>> bean with name 'mvcHandlerMappingIntrospector' defined in class path 
>>>>> resource 
>>>>> [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]:
>>>>>  
>>>>> Invocation of init method failed; nested exception is 
>>>>> org.springframework.beans.factory.BeanCreationException: Error creating 
>>>>> bean with name 'healthEndpointWebMvcHandlerMapping' defined in class path 
>>>>> resource 
>>>>> [org/springframework/boot/actuate/autoconfigure/health/HealthEndpointWebExtensionConfiguration$MvcAdditionalHealthEndpointPathsConfiguration.class]:
>>>>>  
>>>>> Bean instantiation via factory method failed; nested exception is 
>>>>> org.springframework.beans.BeanInstantiationException: Failed to 
>>>>> instantiate 
>>>>> [org.springframework.boot.actuate.endpoint.web.servlet.AdditionalHealthEndpointPathsWebMvcHandlerMapping]:
>>>>>  
>>>>> Factory method 'healthEndpointWebMvcHandlerMapping' threw exception; 
>>>>> nested 
>>>>> exception is 
>>>>> org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
>>>>> creating bean with name 'healthEndpoint' defined in class path resource 
>>>>> [org/springframework/boot/actuate/autoconfigure/health/HealthEndpointConfiguration.class]:
>>>>>  
>>>>> Unsatisfied dependency expressed through method 'healthEndpoint' 
>>>>> parameter 
>>>>> 0; nested exception is 
>>>>> org.springframework.beans.factory.UnsatisfiedDependencyException: Error 
>>>>> creating bean with name 'healthContributorRegistry' defined in class path 
>>>>> resource 
>>>>> [org/springframework/boot/actuate/autoconfigure/health/HealthEndpointConfiguration.class]:
>>>>>  
>>>>> Unsatisfied dependency expressed through method 
>>>>> 'healthContributorRegistry' 
>>>>> parameter 2; nested exception is 
>>>>> org.springframework.beans.factory.BeanCreationException: Error creating 
>>>>> bean with name 'solrSearchCoreHealthIndicator' defined in class path 
>>>>> resource [org/dspace/app/rest/configuration/ActuatorConfiguration.class]: 
>>>>> Bean instantiation via factory method failed; nested exception is 
>>>>> org.springframework.beans.BeanInstantiationException: Failed to 
>>>>> instantiate 
>>>>> [org.springframework.boot.actuate.solr.SolrHealthIndicator]: Factory 
>>>>> method 
>>>>> 'solrSearchCoreHealthIndicator' threw exception; nested exception is 
>>>>> org.apache.solr.client.solrj.impl.HttpSolrClient$RemoteSolrException: 
>>>>> Error 
>>>>> from server at http://localhost:8983/solr/search: Expected mime type 
>>>>> application/octet-stream but got text/html. <p>
>>>>>   Searching for Solr?<br/>
>>>>>   You must type the correct path.<br/>
>>>>>   Solr will respond.
>>>>> </p>
>>>>>
>>>>> While in the dspace.log
>>>>> tBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.27.jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.DefaultSingletonBeanRegistr     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  y.getSingleton(DefaultSingletonBeanRegistry.java:234) 
>>>>> ~[spring-beans-5.3.27.jar:                                                
>>>>>  
>>>>>                                                                           
>>>>>   
>>>>>          5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.AbstractBeanFactory.doGetBe     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  an(AbstractBeanFactory.java:333) ~[spring-beans-5.3.27.jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.AbstractBeanFactory.getBean     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  (AbstractBeanFactory.java:208) ~[spring-beans-5.3.27.jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.config.DependencyDescriptor.resolve     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  Candidate(DependencyDescriptor.java:276) 
>>>>> ~[spring-beans-5.3.27.jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.DefaultListableBeanFactory.     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  doResolveDependency(DefaultListableBeanFactory.java:1391) 
>>>>> ~[spring-beans-5.3.27.                                                    
>>>>>  
>>>>>                                                                           
>>>>>   
>>>>>      jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.DefaultListableBeanFactory.     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  resolveDependency(DefaultListableBeanFactory.java:1311) 
>>>>> ~[spring-beans-5.3.27.ja                                                  
>>>>>  
>>>>>                                                                           
>>>>>   
>>>>>        r:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.annotation.AutowiredAnnotationBeanP     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  
>>>>> ostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPost
>>>>>  
>>>>>                                                                           
>>>>>   
>>>>>                                                         
>>>>>  Processor.java:657) ~[spring-beans-5.3.27.jar:5.3.27]
>>>>>         ... 61 more
>>>>> dAutowireCandidates(DefaultListableBeanFactory.java:1573) 
>>>>> ~[spring-beans-5.3.                                                       
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>  27.jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.DefaultListableBeanFactory.     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  resolveMultipleBeans(DefaultListableBeanFactory.java:1462) 
>>>>> ~[spring-beans-5.3.27                                                     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>    .jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.DefaultListableBeanFactory.     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  doResolveDependency(DefaultListableBeanFactory.java:1349) 
>>>>> ~[spring-beans-5.3.27.                                                    
>>>>>  
>>>>>                                                                           
>>>>>   
>>>>>      jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.DefaultListableBeanFactory.     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  resolveDependency(DefaultListableBeanFactory.java:1311) 
>>>>> ~[spring-beans-5.3.27.ja                                                  
>>>>>  
>>>>>                                                                           
>>>>>   
>>>>>        r:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.ConstructorResolver.resolve     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  AutowiredArgument(ConstructorResolver.java:887) 
>>>>> ~[spring-beans-5.3.27.jar:5.3.27                                          
>>>>>  
>>>>>                                                                           
>>>>>   
>>>>>                ]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.ConstructorResolver.createA     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  rgumentArray(ConstructorResolver.java:791) 
>>>>> ~[spring-beans-5.3.27.jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.ConstructorResolver.autowir     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  eConstructor(ConstructorResolver.java:229) 
>>>>> ~[spring-beans-5.3.27.jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.AbstractAutowireCapableBean     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  
>>>>> Factory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1372) 
>>>>> ~[spri                                                                    
>>>>>  
>>>>>                                                                 
>>>>>  ng-beans-5.3.27.jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.AbstractAutowireCapableBean     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  Factory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1222) 
>>>>> ~[sprin                                                                   
>>>>>   
>>>>>                                                                 
>>>>>  g-beans-5.3.27.jar:5.3.27]
>>>>>         at 
>>>>> org.springframework.beans.factory.support.AbstractAutowireCapableBean     
>>>>>   
>>>>>                                                                           
>>>>>   
>>>>>                                                   
>>>>>  Factory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) 
>>>>> ~[spring-beans                                                            
>>>>>  
>>>>>                                                                         
>>>>>  -5.3.27.jar:5.3.27]
>>>>> Could you help me?
>>>>> Thanks
>>>>> Best regards
>>>>> Massimiliano
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>

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