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Workbook excelWorkBook = new XSSFWorkbook();
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.wflysz.lsl.excelconverter, PID: 3535
java.lang.NoClassDefFoundError: Failed resolution of: Ljava/util/Optional;
at org.apache.poi.openxml4j.opc.internal.PackagePropertiesPart.<init>(PackagePropertiesPart.java:97)
at org.apache.poi.openxml4j.opc.OPCPackage.configurePackage(OPCPackage.java:389)
at org.apache.poi.openxml4j.opc.OPCPackage.create(OPCPackage.java:370)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.newPackage(XSSFWorkbook.java:495)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:261)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:257)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:245)
at com.wflysz.lsl.excelconverter.ExcelCreator.initExcel(ExcelCreator.java:22)
at com.wflysz.lsl.excelconverter.MainActivity.onClick(MainActivity.java:29)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.ClassNotFoundException: Didn't find class "java.util.Optional" on path: DexPathList[[zip file "/data/app/com.wflysz.lsl.excelconverter-2/base.apk"],nativeLibraryDirectories=[/data/app/com.wflysz.lsl.excelconverter-2/lib/x86, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at org.apache.poi.openxml4j.opc.internal.PackagePropertiesPart.<init>(PackagePropertiesPart.java:97)
at org.apache.poi.openxml4j.opc.OPCPackage.configurePackage(OPCPackage.java:389)
at org.apache.poi.openxml4j.opc.OPCPackage.create(OPCPackage.java:370)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.newPackage(XSSFWorkbook.java:495)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:261)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:257)
at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:245)
at com.wflysz.lsl.excelconverter.ExcelCreator.initExcel(ExcelCreator.java:22)
at com.wflysz.lsl.excelconverter.MainActivity.onClick(MainActivity.java:29)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Suppressed: java.lang.ClassNotFoundException: java.util.Optional
at java.lang.Class.classForName(Native Method)
at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
... 19 more
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available