Large number of errors during Gradle build after upgrading to Android Studio 2.0

Question

Recently, I upgraded Android Studio from version 1.5 to 2.0 but since then I observe that the number of errors and warnings has increased. Most of the errors do not make sense. Can someone please help:

AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.validator.ValidatorResources$1) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.digester.ExtendedBaseRules$1) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$5) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$6) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$8) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$9) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$1) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$10) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$11) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$12) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$2) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$3) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$4) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanMap$7) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.BeanUtilsBean$1) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.WrapDynaClass$1) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.WrapDynaClass$2) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} AGPBI: {"kind":"error","text":"warning: Ignoring InnerClasses attribute for an anonymous inner class","sources":[{}]} AGPBI: {"kind":"error","text":"(org.apache.commons.beanutils.locale.LocaleBeanUtilsBean$1) that doesn\u0027t come with an","sources":[{}]} AGPBI: {"kind":"error","text":"associated EnclosingMethod attribute. This class was probably produced by a","sources":[{}]} AGPBI: {"kind":"error","text":"compiler that did not target the modern .class file format. The recommended","sources":[{}]} AGPBI: {"kind":"error","text":"solution is to recompile the class from source, using an up-to-date compiler","sources":[{}]} AGPBI: {"kind":"error","text":"and without specifying any \"-target\" type options. The consequence of ignoring","sources":[{}]} AGPBI: {"kind":"error","text":"this warning is that reflective operations on this class will incorrectly","sources":[{}]} AGPBI: {"kind":"error","text":"indicate that it is *not* an inner class.","sources":[{}]} 

Answer 1

You can get rid of the meaningless warnings and errors by deleting the .idea folder that Android Studio 1.5 created and importing the the project into Android Studio 2.0 as a gradle project. It will recreate the .idea folder automatically.

Answer 2

Adding -keepattributes EnclosingMethod to proguard rules suppresses these errors and warnings.

Worked for me like a charm.

Update : Adding -keepattributes EnclosingMethod to proguard rules actually changes how the classes are obfuscated. This preserves the optional attributes that are typically necessary for your code to be executed WITHOUT such issue.