You need to find out exactly which expressional evaluates to null. My
guess is that tx_in.getConnectedOutput() returns null and then when
getScriptPubKey() is called on the null reference a NullPointerException
is thrown.
On 11/03/2019 20.37, J wrote:
> Should I make a toString() method there?
> Also, if I try something like this, I get the same NPE.:
>
> transactionsList.setCellFactory(new Callback<ListView<Transaction>,
> ListCell<Transaction>>() {
> @Override
> public ListCell<Transaction> call(ListView<Transaction> param) {
> return new TextFieldListCell<Transaction>(new
> StringConverter<Transaction>() {
> @Override
> public String toString(Transaction tx) {
> Coin value = tx.getValue(Main.bitcoin.wallet());
> if(value.isPositive()) {
>
> Address sender_address = null;
> for(TransactionInput tx_in : tx.getInputs()){
> if(!tx_in.isCoinBase()){
>
>
>
> sender_address=tx_in.getConnectedOutput().getScriptPubKey().getToAddress(MainNetParams.get());
>
>
> }
> }
> return "Incoming payment of
> "+MonetaryFormat.BTC.format(value) + " from: " + sender_address ;
> }
>
> I'm using IntelliJ IDEA and when I use getScriptPubKey() it shows me this
> message:
>
> Method invocation 'getScriptPubKey' may produce 'NullPointerException'
>
> I don't know if this might be useful to know if the problem comes from my
> code, I just modified the wallettemplate.MainController class to check how
> inputs/outputs work and I haven't done anything to the transaction "tx".
>
>
>
>
>
> El lunes, 11 de marzo de 2019, 19:28:25 (UTC+1), Andreas Schildbach
> escribió:
>
> The NPE is happening in your own code.
>
> Bitcoinj 0.14.7 doesn't have a method
> wallettemplate.MainController$1$1.toString().
>
> Maybe tx_out is null? TransactionOutput.getScriptPubKey() can hardly be
> null, since an instance is created there and returned.
>
>
> On 11/03/2019 12.39, J wrote:
> > 0.14.7
> >
> > El lunes, 11 de marzo de 2019, 12:32:34 (UTC+1), Andreas Schildbach
> > escribió:
> >
> > Also, what version of bitcoinj are you using?
> >
> >
> > On 11/03/2019 10.02, J wrote:
> > > This is the exception:
> > > java.lang.NullPointerException
> > > at
> >
> wallettemplate.MainController$1$1.toString(MainController.java:109)
> > > at
> wallettemplate.MainController$1$1.toString(MainController.java:99)
> > > at
> >
> javafx.scene.control.cell.CellUtils.getItemText(CellUtils.java:100)
> > > at
> javafx.scene.control.cell.CellUtils.updateItem(CellUtils.java:201)
> > > at
> > >
> >
>
> javafx.scene.control.cell.TextFieldListCell.updateItem(TextFieldListCell.java:201)
>
> >
> > > at javafx.scene.control.ListCell.updateItem(ListCell.java:471)
> > > at
> javafx.scene.control.ListCell.lambda$new$41(ListCell.java:167)
> > > at
> > >
> >
>
> javafx.collections.WeakListChangeListener.onChanged(WeakListChangeListener.java:88)
>
> >
> > > at
> > >
> >
>
> com.sun.javafx.collections.ListListenerHelper$Generic.fireValueChangedEvent(ListListenerHelper.java:329)
>
> >
> > > at
> > >
> >
>
> com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:73)
>
> >
> > > at
> > >
> >
>
> javafx.collections.ObservableListBase.fireChange(ObservableListBase.java:233)
>
> >
> > > at
> >
> javafx.collections.ListChangeBuilder.commit(ListChangeBuilder.java:482)
> > > at
> > >
> >
> javafx.collections.ListChangeBuilder.endChange(ListChangeBuilder.java:541)
>
> >
> > > at
> > >
> >
>
> javafx.collections.ObservableListBase.endChange(ObservableListBase.java:205)
>
> >
> > > at
> > >
> >
>
> javafx.collections.ModifiableObservableListBase.addAll(ModifiableObservableListBase.java:113)
>
> >
> > > at
> > >
> >
>
> com.sun.javafx.binding.ContentBinding$ListContentBinding.onChanged(ContentBinding.java:117)
>
> >
> > > at
> > >
> >
>
> com.sun.javafx.collections.ListListenerHelper$SingleChange.fireValueChangedEvent(ListListenerHelper.java:164)
>
> >
> > > at
> > >
> >
>
> com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:73)
>
> >
> > > at
> > >
> >
>
> javafx.collections.ObservableListBase.fireChange(ObservableListBase.java:233)
>
> >
> > > at
> >
> javafx.collections.ListChangeBuilder.commit(ListChangeBuilder.java:482)
> > > at
> > >
> >
> javafx.collections.ListChangeBuilder.endChange(ListChangeBuilder.java:541)
>
> >
> > > at
> > >
> >
>
> javafx.collections.ObservableListBase.endChange(ObservableListBase.java:205)
>
> >
> > > at
> > >
> >
>
> javafx.collections.ModifiableObservableListBase.setAll(ModifiableObservableListBase.java:90)
>
> >
> > > at
> wallettemplate.utils.BitcoinUIModel.update(BitcoinUIModel.java:68)
> > > at
> >
> wallettemplate.utils.BitcoinUIModel.access$100(BitcoinUIModel.java:39)
> > > at
> > >
> >
>
> wallettemplate.utils.BitcoinUIModel$1.onWalletChanged(BitcoinUIModel.java:58)
>
> >
> > > at org.bitcoinj.wallet.Wallet$4.run(Wallet.java:2919)
> > > at
> > >
> >
>
> com.sun.javafx.application.PlatformImpl.lambda$null$177(PlatformImpl.java:295)
>
> >
> > > at java.security.AccessController.doPrivileged(Native Method)
> > > at
> > >
> >
>
> com.sun.javafx.application.PlatformImpl.lambda$runLater$178(PlatformImpl.java:294)
>
> >
> > > at
> > >
> >
>
> com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
>
> >
> > > at
> >
> com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native
> > > Method)
> > > at
> > >
> >
>
> com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:204)
>
> >
> > > at
> >
> com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:511)
> > > at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107)
> > > at
> > >
> >
>
> com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:590)
>
> >
> > > at javafx.stage.Stage.showAndWait(Stage.java:474)
> > > at wallettemplate.utils.GuiUtils.runAlert(GuiUtils.java:52)
> > > at
> >
> wallettemplate.utils.GuiUtils.lambda$crashAlert$1(GuiUtils.java:63)
> > > at wallettemplate.utils.GuiUtils.crashAlert(GuiUtils.java:67)
> > > at
> > >
> >
>
> wallettemplate.utils.GuiUtils.lambda$handleCrashesOnThisThread$2(GuiUtils.java:75)
>
> >
> > > at
> com.sun.glass.ui.Application.reportException(Application.java:453)
> > > at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
> > > at
> > >
> >
>
> com.sun.glass.ui.win.WinApplication.lambda$null$152(WinApplication.java:177)
>
> >
> > > at java.lang.Thread.run(Thread.java:748)
> > >
> > > and this is the piece of code:
> > >
> > > tx_out.getScriptPubKey().getToAddress(MainNetParams.get());
> > //tx_out
> > > is one of the outputs of the transaction
> > >
> > > El lunes, 11 de marzo de 2019, 2:27:45 (UTC+1), Andreas
> Schildbach
> > escribió:
> > >
> > > Can you post the exception and the piece of code you're
> using?
> > Also,
> > > what version of bitcoinj are you using?
> > >
> > >
> > > On 10/03/2019 20.04, J wrote:
> > > > When trying to get the address of an output, if I call
> the
> > method
> > > > getScriptPubKey() I always get a null pointer exception.
> > > > I checked this
> > > >
> > >
> >
> <https://groups.google.com/forum/#!msg/bitcoinj/27k8xsf29Dw/WRA6csmm-vEJ
> <https://groups.google.com/forum/#!msg/bitcoinj/27k8xsf29Dw/WRA6csmm-vEJ>
>
> >
> <https://groups.google.com/forum/#!msg/bitcoinj/27k8xsf29Dw/WRA6csmm-vEJ
> <https://groups.google.com/forum/#!msg/bitcoinj/27k8xsf29Dw/WRA6csmm-vEJ>>
>
> >
> > >
> >
> <https://groups.google.com/forum/#!msg/bitcoinj/27k8xsf29Dw/WRA6csmm-vEJ
> <https://groups.google.com/forum/#!msg/bitcoinj/27k8xsf29Dw/WRA6csmm-vEJ>
>
> >
> <https://groups.google.com/forum/#!msg/bitcoinj/27k8xsf29Dw/WRA6csmm-vEJ
>
> <https://groups.google.com/forum/#!msg/bitcoinj/27k8xsf29Dw/WRA6csmm-vEJ>>>>
> and
>
> >
> > >
> > > > this
> > > >
> > >
> >
>
> <https://bitcoin.stackexchange.com/questions/2370/how-to-get-destination-address-from-bitcoinj-transactionoutput
>
> <https://bitcoin.stackexchange.com/questions/2370/how-to-get-destination-address-from-bitcoinj-transactionoutput>
>
> >
>
> <https://bitcoin.stackexchange.com/questions/2370/how-to-get-destination-address-from-bitcoinj-transactionoutput
>
> <https://bitcoin.stackexchange.com/questions/2370/how-to-get-destination-address-from-bitcoinj-transactionoutput>>
>
> >
> > >
> >
>
> <https://bitcoin.stackexchange.com/questions/2370/how-to-get-destination-address-from-bitcoinj-transactionoutput
>
> <https://bitcoin.stackexchange.com/questions/2370/how-to-get-destination-address-from-bitcoinj-transactionoutput>
>
> >
>
> <https://bitcoin.stackexchange.com/questions/2370/how-to-get-destination-address-from-bitcoinj-transactionoutput
>
> <https://bitcoin.stackexchange.com/questions/2370/how-to-get-destination-address-from-bitcoinj-transactionoutput>>>>,
>
> >
> > >
> > > > but seems unsolved and the link to the github
> repository on
> > > > StackExchange is not working.
> > > > I tried checking if the transaction is coinbase first,
> but
> > still the
> > > > same error.
> > > >
> > > > Any ideas on how to solve this?
> > > >
> > > > --
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