Re: [dspace-tech] DSpace 8.0 installation 502 bad Gateway error

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DSpace Technical Support

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Jul 25, 2024, 4:55:45 PM7/25/24

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Hi,

The original error you shared seems to be saying that DSpace cannot connect to Solr:

ERROR unknown unknown org.dspace.discovery.SolrSearchCore @ Error while initializing solr server http://PUBLIC_IP:8983/solr/search

You should double check that Solr is running at that IP and port. If not, you may need to modify the Solr configs. You also mentioned running Solr 9, while DSpace 8 currently supports Solr 8: https://wiki.lyrasis.org/display/DSDOC8x/Installing+DSpace#InstallingDSpace-ApacheSolr8.x(full-textindex/searchservice)

The 502 Bad Gateway error sounds like it might be a misconfigured proxy. If you are running Nginx or Apache in front of the Runnable JAR, you may want to double check your settings in Nginx and/or Apache, keeping in mind the examples in step 16 (Production Installation) of the Backend Install: https://wiki.lyrasis.org/display/DSDOC8x/Installing+DSpace#InstallingDSpace-BackendInstallation You could also try to see if the backend works on port 8080, the default Tomcat port, first...and then try to setup the proxy as a second step. This is the process detailed in the installation guide.

Tim

On Thursday, July 25, 2024 at 7:51:58 AM UTC-5 faogu...@ngren.edu.ng wrote:

Hi everyone,

I forgot to include that I used Runnable JAR application without the optional parameters
java -jar /dspace/webapps/server-boot.jar.

It showed the spring boot logo only

On Tue, Jul 23, 2024 at 1:03 PM Femi Ogundele <faogu...@ngren.edu.ng> wrote:
I am getting the following errors when test the backend server installation. I am new to DSpace 8.0. Please, how do I get it up working properly?

root@server1:/build/dspace-angular-dspace-8.0/config# yarn test:rest yarn run v1.22.22
$ ts-node --project ./tsconfig.ts-node.json scripts/test-rest.ts
Building production app config
Overriding app config with /build/dspace-angular-dspace-8.0/config/config.yml
Overriding app config with /build/dspace-angular-dspace-8.0/config/config.prod.yml
...Testing connection to REST API at https://niris.ngren.edu.ng/server/api...

RESPONSE: 502 Bad Gateway

ERROR: INVALID DSPACE REST API! Response is not valid JSON!
Response returned:
<html>
<head><title>502 Bad Gateway</title></head>
<body>
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/1.24.0 (Ubuntu)</center>
</body>
</html>

Done in 1.58s.

Apache Maven 3.9.8 (36645f6c9b5079805ea5009217e36f2cffd34256)
Maven home: /opt/maven
Java version: 17.0.11, vendor: Ubuntu, runtime: /usr/lib/jvm/java-17-openjdk-amd64
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "6.8.0-38-generic", arch: "amd64", family: "unix"

solr-9.6.1

/dspace/log/dspace.log indicates some errors as shown below:

2024-07-23 06:41:31,640 WARN unknown unknown org.springframework.aop.framework.CglibAopProxy @ Unable to proxy interface-implementing method [public final java.lang. Iterable org.dspace.app.rest.repository.DSpaceRestRepository.findAll(org.springframework.data.domain.Sort)] because it is marked as final, consider using Interface-based JDK proxies instead.>
2024-07-23 06:41:31,640 WARN unknown unknown org.springframework.aop.framework.CglibAopProxy @ Unable to proxy interface-implementing method [public final java.lang.Iterable org.dspace.app.rest.repository.DSpaceRestRepository.findAll()] because it is marked as final, consider using interface-based JDK proxies instead.
>
2024-07-23 06:41:32,011 INFO unknown unknown org.springframework.boot.autoconfigure.web.servlet.WelcomePageHandlerMapping @ Adding welcome page: class path resource [>
2024-07-23 06:41:32,523 ERROR unknown unknown org.dspace.discovery.SolrSearchCore @ Error while initializing solr server http://PUBLIC_IP:8983/solr/search
org.apache.solr.client.solrj.SolrServerException: Server refused connection at: http://154.68.232.18:8983/solr/search
at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:688) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e932038658>
at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:266) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e9320386588d12d >
at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:248) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e9320386588d12d >
at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:225) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e9320386588d12d - houstonpu>
at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:1035) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e9320386588d12d - houstonputma>
at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:1051) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e9320386588d12d - houstonputma>
at org.dspace.discovery.SolrSearchCore.initSolr(SolrSearchCore.java:96) ~[dspace-api-8.0.jar!/:8.0]
at org.dspace.discovery.SolrSearchCore.getSolr(SolrSearchCore.java:59) ~[dspace-api-8.0.jar!/:8.0]
at org.dspace.app.rest.configuration.ActuatorConfiguration.solrSearchCoreHealthIndicator(ActuatorConfiguration.java:59) ~[dspace-server-webapp-8.0.jar!/:8.0]

2024-07-23 06:41:31,640 WARN unknown unknown org.springframework.aop.framework.CglibAopProxy @ Unable to proxy interface-implementing method [public final java.lang. Iterable org.dspace.app.rest.repository.DSpaceRestRepository.findAll(org.springframework.data.domain.Sort)] because it is marked as final, consider using Interface-based JDK proxies instead.>
2024-07-23 06:41:31,640 WARN unknown unknown org.springframework.aop.framework.CglibAopProxy @ Unable to proxy interface-implementing method [public final java.lang.Iterable org.dspace.app.rest.repository.DSpaceRestRepository.findAll()] because it is marked as final, consider using interface-based JDK proxies instead.
>
2024-07-23 06:41:32,011 INFO unknown unknown org.springframework.boot.autoconfigure.web.servlet.WelcomePageHandlerMapping @ Adding welcome page: class path resource [>
2024-07-23 06:41:32,523 ERROR unknown unknown org.dspace.discovery.SolrSearchCore @ Error while initializing solr server http://PUBLIC_IP:8983/solr/search
org.apache.solr.client.solrj.SolrServerException: Server refused connection at: http://154.68.232.18:8983/solr/search
at org.apache.solr.client.solrj.impl.HttpSolrClient.executeMethod(HttpSolrClient.java:688) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e932038658>
at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:266) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e9320386588d12d >
at org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:248) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e9320386588d12d >
at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:225) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e9320386588d12d - houstonpu>
at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:1035) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e9320386588d12d - houstonputma>
at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:1051) ~[solr-solrj-8.11.3.jar!/:8.11.3 baa7c80af4278cc8951a344d8e9320386588d12d - houstonputma>
at org.dspace.discovery.SolrSearchCore.initSolr(SolrSearchCore.java:96) ~[dspace-api-8.0.jar!/:8.0]
at org.dspace.discovery.SolrSearchCore.getSolr(SolrSearchCore.java:59) ~[dspace-api-8.0.jar!/:8.0]
at org.dspace.app.rest.configuration.ActuatorConfiguration.solrSearchCoreHealthIndicator(ActuatorConfiguration.java:59) ~[dspace-server-webapp-8.0.jar!/:8.0]

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Femi, Ogundele
Nigerian Research and Education Network,
Peter Okebukola Building,
26, Aguyi Ironsi Street,
Maitama, Abuja.
Nigeria
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