# Cannot import Java class **URL:** \ **Category:** Elasticsearch\ **Created:** [November 7, 2018, 2:14am UTC](https://discuss.elastic.co/t/cannot-import-java-class/155649 "2018-11-07T02:14:21Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Wa\_Tse](https://avatars.discourse-cdn.com/v4/letter/w/d07c76/32.png) [@Wa\_Tse](https://discuss.elastic.co/u/Wa_Tse)\ **Post date:** [November 7, 2018, 2:14am UTC](https://discuss.elastic.co/t/cannot-import-java-class/155649/1 "2018-11-07T02:14:22Z")
When I try to test to connect to ElasticSearch using Java API, I cannot import the Java class. Then I try to use decomplier to check on the class file and exception is shown. I find the same problem in window zip and linux zip. Please advise if there is anything wrong. ![es1](https://us1.discourse-cdn.com/elastic/original/3X/5/8/585578461542f542961b3b2cd613df35925e3ea8.png) ![es2](https://us1.discourse-cdn.com/elastic/original/3X/3/d/3dc4665b2518ea5fcf48a825ddbbb7a0c405bf4a.png) ![es3](https://us1.discourse-cdn.com/elastic/original/3X/9/9/9903d16251aee956a7159a69e9fdf90d614c5798.png) ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [November 7, 2018, 3:21am UTC](https://discuss.elastic.co/t/cannot-import-java-class/155649/2 "2018-11-07T03:21:25Z")
Just add elasticsearch dependency with maven ---
**Author:** ![Wa\_Tse](https://avatars.discourse-cdn.com/v4/letter/w/d07c76/32.png) [@Wa\_Tse](https://discuss.elastic.co/u/Wa_Tse)\ **Post date:** [November 7, 2018, 3:25am UTC](https://discuss.elastic.co/t/cannot-import-java-class/155649/3 "2018-11-07T03:25:53Z")
Is it a must to use elasticsearch with maven? I have already download all related jar and try to do without maven. But it seems odd that I cannot open the class in decomplier. If there is dependency issue, shouldn't the message like 'Class Not found' instead of 'Invalid Input File' show? ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [November 7, 2018, 6:29am UTC](https://discuss.elastic.co/t/cannot-import-java-class/155649/4 "2018-11-07T06:29:54Z")
It's much easier to use a dependency manager than trying to download every single jar. Coming back to your problem I don't know. It's more an IDE issue than anything related to elasticsearch. What I'm doing with my IDE is to ask to download sources as well. ---
**Author:** ![Wa\_Tse](https://avatars.discourse-cdn.com/v4/letter/w/d07c76/32.png) [@Wa\_Tse](https://discuss.elastic.co/u/Wa_Tse)\ **Post date:** [November 7, 2018, 9:08am UTC](https://discuss.elastic.co/t/cannot-import-java-class/155649/5 "2018-11-07T09:08:16Z")
Thanks David. I try to use another IDE and I can finally see the missing java class in import. But there are still some problem. 1. There are still some java class missing. 2. While I can import the class now, the IDE still cannot detect the method in the class. There are obvious issues related to the IDE, so I would like to know if you can share your environment setting (e.g. JDK version, IDE version, etc.). ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [November 7, 2018, 9:42am UTC](https://discuss.elastic.co/t/cannot-import-java-class/155649/6 "2018-11-07T09:42:23Z")
I'm using IntelliJ but others are using Eclipse. +maven +java \>= 8 (10 at this moment) ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 5, 2018, 9:42am UTC](https://discuss.elastic.co/t/cannot-import-java-class/155649/7 "2018-12-05T09:42:25Z")
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