Hi,
Lucene has no official Android support. Lucene 4.7 is the last version that (may) work with Android, because it is limited to Java 6, which is mostly supported by Android. Java 7 is only partially supported. Later Lucene versions (4.8+ requires minimum Java 7) uses many of the new Java language and API features in its core APIs (this is what you see with MethodHandles), which is very important for performance and security reasons. In addition, Lucene 5.x makes more heavy use of Java 7, because all I/O APIs were changed to use NIO.2 (java.io.File is gone). This is for safety on index commits. Since Lucene 6 we require Java 8 as minimum version (Lambdas,…). There are no plans to support older Java versions anymore, so unless Android is *fully* Java 7 compatible (including MethodHandles APIs), you are stuck with 4.7.x. The main branch is Java 8, so it is impossible to support Android. Please ask Google to finally fix Android to be compatible to Java SE. Please note, Apache Lucene Core is using “compact1” profile, so if Android supports Java 8, Lambdas, and all APIs from the “compact1” profile (which is intended for mobile devices), you can use the core JAR file. Uwe ----- Uwe Schindler Achterdiek 19, D-28357 Bremen http://www.thetaphi.de <http://www.thetaphi.de/> eMail: u...@thetaphi.de From: xufusheng [mailto:xufush...@huawei.com] Sent: Wednesday, January 18, 2017 10:02 AM To: dev@lucene.apache.org Cc: Lipeng (Honor) <lane...@huawei.com>; xueyakun <xueya...@huawei.com>; Lixiang (Tony) <tony.lixi...@huawei.com> Subject: is there a Lucene that can be used on Android devices Hi Lucene dev team， I am a Android software engineer from Huawei Device Company, and have some Android compatible issues wandering if you can help to clarify. Our latest smart phone MATE9 use Lucene as the search engine for local information, such as message in Email, SMS, Calendar and so on. But the Lucene jar version is very old (4.5.0), because if use newer version, APK will crash with the following information: java.lang.NoClassDefFoundError: Failed resolution of: Ljava/lang/invoke/MethodHandles; We found that the JDK in Android is slightly different with desktop version which Lucene build upon. So, we would like to know: Is there any plan that Lucene team will develop a “Lite”version that could run on a mobile device, or fix the crash issues which will enable the current version compatible with Android platform. Also, if we fix the Android compatible issues, is it possible for us to submit changes into the main branch? Best Regards, Fusheng Xu from Huawei.
